Blood clots can occur in the venous and arterial vascular system. Blood clots can form in the heart, legs, arteries, veins, bladder, urinary tract and uterus. Risk factors for causes of blood clots include high blood pressure and cholesterol, diabetes, smoking, and family history.
Symptoms of a blood clot depend on the location of the clot. Some blood clots are a medical emergency. Blood clots are treated depending upon the cause of the clot. Blood clots can be prevented by lowering the risk factors for developing blood clots. Read more: Blood Clots Article
Multimedia: Slideshows, Images & Quizzes
DVT (Deep Vein Thrombosis) and Pulmonary Embolism (PE) Quiz
Take the Deep Vein Thrombosis and Pulmonary Embolism Quiz to learn causes, symptoms, and treatments for these two dangerous...
Stroke Quiz: Test Your Medical IQ
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Heart Disease Quiz: Test Your Medical IQ
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Blood and Bleeding Disorders Quiz
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Picture of Hypertension
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Picture of Blood Pressure
The blood pressure is the pressure of the blood within the arteries. See a picture of Blood Pressure and learn more about the...
Picture of Heart Detail
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Catheter procedures are much easier than surgery on patients because they involve only a needle puncture in the skin where the...
Picture of Cholesterol
Cholesterol carried in particles of low density (LDL cholesterol) is referred to as the "bad" cholesterol because elevated levels...
Picture of Blood Clot
Blood that has been converted from a liquid to a solid state. See a picture of Blood Clot and learn more about the health topic....
Picture of Heart
The muscle that pumps blood received from veins into arteries throughout the body. See a picture of the Heart and learn more...
Heart Disease: Symptoms, Signs, and Causes
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Heart-Healthy Diet: 25 Foods to Protect Your Cardiovascular System
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Stroke Causes, Symptoms, and Recovery
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Heart Disease: Causes of a Heart Attack
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Bladder Infections: UTI Causes, Symptoms, Treatments
Urinary tract infections (UTI), including bladder infections, affect women and men, causing UTI symptoms like kidney infection....
Cholesterol Levels: What the Numbers Mean
Do you know the different cholesterol levels and what they mean? Learn the alphabet soup of cholesterol testing: LDL, HDL, good,...
A Visual Guide to Deep Vein Thrombosis
Deep vein thrombosis (DVT) is a dangerous and sometimes fatal blood clot that occurs deep within the lower leg or thigh....
High-Fiber Super Foods: Whole Grains, Fruits, & More
Learn about high-fiber foods. From fresh fruits to whole grains, these fiber-rich foods can lower cholesterol, prevent...
Food Swaps for Meals and Snacks for Heart Health in Pictures
Explore 10 food swaps for heart-wise dining. Learn what food to buy and how to cook in order to make a big difference for your...
Drug Interactions: Foods, Drugs, Herbs Affecting Medications
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Treatment & Diagnosis
- CT Scan (Computerized Tomography)
- Total Hip Replacement
- Total Knee Replacement
- Electrocardiogram (ECG or EKG)
- Homocysteine (Normal and Elevated Levels Blood Test)
- Cardiac Catheterization
- C-Section (Cesarean Birth)
- CT Scan vs. MRI (Differences between Machines, Costs, Uses)
- Heart Disease FAQs
- Blood and Bleeding Disorders FAQs
- Stroke FAQs
- Deep Vein Thrombosis and Pulmonary Embolism FAQs
- Heart Attack Risk and Medicated Stents
- Drug Interactions: Know Ingredients, Consult Your Physician
- Serena Williams Battles Pulmonary Embolism and a Hematoma
- Sickle Trait and Sickle Cell Disease
- Blood Doping
- Cardiac Arrest Symptoms and Causes
Medications & Supplements
- acetaminophen (Tylenol, Tylenol Arthritis Pain, Tylenol Ext, Little Fevers Children's Fever/Pain)
- warfarin (Coumadin, Jantoven)
- ibuprofen (Advil, Children's Advil/Motrin, Medipren, Motrin, Nuprin, PediaCare Fever, and others)
- ticlopidine, Ticlid (discontinued brand in the US)
- Birth Control Pills (List of Oral Contraceptives and Side Effects)
- clopidogrel (Plavix)
- alteplase (TPA, Activase, Cathflo Activase)
- Lovenox (enoxaparin)
- dalteparin injection (Fragmin)
- vitamin K-1, phytonadione (Mephyton)
- apixaban (Eliquis)
- rivaroxaban (Xarelto)
- idarucizumab (Praxbind)
- Anticoagulants (Anticoagulant Drug Class)
- Coumadin vs. Plavix (Differences and Similarities)
- Aspirin vs. Aleve (Naproxen)
- Aspirin vs. Eliquis (apixaban)
- Aspirin vs. Tylenol (acetaminophen)
- Aspirin vs. warfarin (Coumadin, Jantoven)
- Aspirin vs. Xarelto (rivaroxaban)
Prevention & Wellness
- Aspirin, Anti-Clotting Meds Safe After Bleeding Stroke: Study
- AHA News: Study Finds Higher Risk of Stroke-Linked Plaque in Men, Possible Test for Women
- AHA News: Dangerous Blood Clots May Be the Latest Risk From 'Bad' Cholesterol
- Window for Safe Use of Clot-Buster Widens for Stroke Patients
- AHA News: Woman Almost Declared Dead No Stranger to Heart Trouble
- Experimental Blood Thinner May Help Prevent Stroke, Without the Bleeding Risk
- Lab-Grown Blood Vessels Could Be Big Medical Advance
- Your Apple Watch Might Help Spot a Dangerous Irregular Heartbeat
- AHA News: Overweight Kids at Higher Risk for Blood Clots as Adults
- Actor Luke Perry Dies of Stroke at Age 52
- Cablivi Approved for Rare Clotting Disorder
- Health Tip: Understanding Blood Clots
- Too Much Salt Might Help Spur A-Fib
- Health Tip: Risk Factors For AFib
- Vaccine to Stop Recurrent Strokes Shows Promise in Mice
- Shorter People May Duck Risk of Varicose Veins
- New Device Approved for Tears in Heart's Blood Vessels
- Hiccups for a Month? It Can Happen
- Giving Plasma During Air Transport May Save Trauma Patients
- E-Cig Flavorings May Damage Lining of Blood Vessels
- Surgical Blood Transfusions Tied to Clot Risk
- Further Signs That Too Much Sitting Can Raise Clot Risk
- Health Tip: Factors That Raise Risk of Blood Clot
- A Better Clot-Buster Drug for Strokes?
- Magnetic Heart Pump Cuts Risk of Blood Clots, Stroke in Study
- Varicose Veins Tied to Higher Odds for Blood Clots
- Too Much TV Could Boost Your Odds for a Blood Clot
- 'Jeopardy!' Host Recuperating From Removal of Clots in Brain
- Binge-Watchers, Beware: Long TV Time Poses Clot Risk
- Genetic Testing May Help Make Blood Thinner Safer
- There May Be a Big Medical Upside to Being Short
- Nurses Learn How to Get Patients to Say 'Yes' to Blood Thinners
- Heart Risks May Rise After Cancer Diagnosis
- McCain's Recovery Time After Surgery Uncertain, Experts Say
- Early Care by Cardiologist May Lower Stroke Risk for A-Fib Patients
- Deciding If Double Knee Replacement Is Right for You
- Dying Patients Often Given Medicines That Won't Help Them
- Common Food Nutrient Tied to Risky Blood Clotting
- For Firefighters, Another Danger: The Heart
- How Doctors Decide to Treat a Ruptured Achilles
- Smokers Prone to Problems After Joint Replacement: Study
- Many With Irregular Heartbeat Not on Meds They Need: Study
- Study Tracks Bleeding Risk From Common Blood Thinners
- Hip Fracture's Link to Early Death May Last Years
- Too Many Stroke Victims Don't Get Clot-Busting Drug: Study
- More Evidence Ties Gum Health to Stroke Risk
- How the Neanderthal in Your Genes Affects Your Health
- Study Finds Stroke Care Faster for Men Than Women
- Rude, Disrespectful Surgeons May Also Be More Error-Prone: Study
- 5 Ways Women Can Cut Their Heart Attack Risk
- Drinking Peroxide as 'Natural' Cure Leads to Dangerous Blood Clots
- Soft Robotic Sleeve Shows Promise for Failing Hearts
- One-Third With Common Irregular Heartbeat Don't Take Blood Thinners
- Taking a Holiday Trip? Protect Yourself From Blood Clots
- Another Step Closer to Artificial Blood
- Pradaxa Blood Thinner May Beat Warfarin After Bleeding Episode: Study
- Testosterone Therapy May Be Linked to Serious Blood Clots
- Lifestyle, Stress May Play Role in Heart Rhythm Disorder
- Many Atrial Fibrillation Patients Missing Out on Blood Thinners
- Many With Common Irregular Heartbeat Unaware of Stroke Risk
- Gene Test May ID Chemo Patients at Risk of Clots: Study
- Device Approved to Prevent Second Strokes in Certain Heart Patients
- Pregnancy May Boost Stroke Risk in Younger Women: Study
- Sleep Apnea May Boost Risk for Post-Op Problems
- When Complications Arise, Some Hospitals Get Paid a Lot More
- C-Section Raises Risk of Blood Clots After Childbirth: Review
- Clot Retrieval Device Approval Expanded
- Heart Rhythm Disorder May Be Tied to Wider Range of Ills
- Aspirin Often Wrongly Prescribed for Atrial Fibrillation
- After Heart Attack, New Threat: Heart Failure
- Clues to How Popular Heartburn Drug Might Harm Arteries
- Widely Used Heart Drug Tied to Dementia Risk
- Sleep Apnea May Raise Heart Risks in People With Pacemakers
- Warfarin Can Be Safe, Effective for People With Irregular Heartbeat
- FDA Approves First Wire-Free Pacemaker
- Many With Irregular Heartbeat Missing Out on Stroke-Preventing Treatments
- For Stroke Patients, Temporary Easing of Symptoms Can Be Deceiving
- Stroke Risk May Be Greater for Certain Migraine Sufferers: Studies
- Excess Weight Linked to Blood Clot Risk in Kids
- Immune Cells Repair Damage to Blood-Brain Barrier in Mice
- Study: Tissue Heart Valves Seem Best for Middle-Aged Patients
- Safe to Use Blood Thinner Before Major Cancer Surgery, Study Finds
- The Pill, Hormone Therapy Safe for Women Taking Blood Thinners: Study
- Should You Be Taking Aspirin Daily?
- Horror Films Really Can Curdle Your Blood
- Heart Disease Doesn't Take a Holiday
- Heart Valve Patients Who Manage Their Own Blood Thinners May Do Better
- Extracting Clot Beats Clot-Busting Drug Alone in Study of Stroke Patients
- Coagadex Approved for Rare Clotting Disorder
- FDA Approves Drug to Reverse Blood Thinner's Effect
- Knee, Hip Replacement Surgeries Linked to Heart Risks
- Too Much TV Time Tied to Higher Odds for Blood Clot in Lung: Study
- Most Don't Need 'Bridging' When They Stop Warfarin Temporarily
- Antibiotic May Lower Effect of Some Blood Thinners
- Study Sees No Link Between Testosterone Therapy and Blood Clots
- How Long Do Patients With Clots in the Lung Need Blood Thinners?
- Weight-Loss Surgery May Beat Diet, Exercise as Type 2 Diabetes Treatment
- Heart Association's Stroke Guidelines Support Clot-Removing Device
- Anti-Clotting Drug Approved For Angioplasty
- Blood Thinners OK for Cancers That Spread to Brain, Study Finds
- Newer Birth Control Pills May Slightly Raise Blood Clot Risk
- COPD Raises Cardiac Death Risk for Those With Irregular Heartbeat
- Blood Thinners Overprescribed for Low-Risk Irregular Heartbeat: Study
- Pouch in Heart May Trigger Unexplained Strokes: Study
- Manual Clot Removal After Heart Attack May Not Help, Could Harm
- Aspirin 'Resistance' May Make for Worse Strokes: Study
- New Device Treats Superficial Varicose Veins
- Newer Blood Thinner Beats Heparin for Certain Heart Attacks
- Battlefield Blood-Transfusion 'Recipe' Passes Real-Life Test
- Infection Most Likely Cause of Hospital Readmission After Surgery
- FDA OKs New Anti-Clotting Drug for Heart Rhythm Disorder
- Blood-Thinning Drug Savaysa Approved
- Jakafi Approved for Chronic Bone Marrow Disease
- Time Spent in the OR May Be Linked to Blood Clots, Study Shows
- Long-Term Use of Aspirin Plus Blood Thinner Is Safe: Study
- Some Painkillers Tied to Bleeding Risk in Those With Abnormal Heartbeat
- Heart Device May Cut Stroke Risk in Those With Irregular Heartbeat: Study
- ER Visits for Common Irregular Heartbeat Are Rising, Study Finds
- Bed Position Matters for Stroke Patients, Report Shows
- Prescribe Blood Thinner Pradaxa With Caution, Study Warns
- FDA Approves New Vaccine to Protect Against Meningitis
- Doctors Often Unaware Their Patients Have Catheters
- Common Painkillers Tied to Blood Clot Risk, Study Suggests
- Most Treatments for Blood Clots Appear Safe, Effective
- Study: Aspirin Might Work Instead of Warfarin for Deep Vein Clots
- FDA Approves New DVT Blood Clot Treatment
- Speedy Delivery of Clot-Busting Drug Helps Stroke Patients Avoid Disability
- Blood Thinner Doesn't Prevent Miscarriages: Study
- Preemies May Have Higher Risk of Blood Clots, Even as Adults
- Study Casts Doubt on Costly Treatment for Leg Clots
- High-Salt Diets Could Double Risk of Heart Woes for Diabetics
- Weight Loss Surgery May Help Ease Urinary Incontinence
- Blood Thinners May Not Be Needed for Kids' Back Surgery
- Cervical Cancer Vaccine Doesn't Boost Clot Risk: Study
- More Painkillers May Raise Heart Risks for Older Women: Review
- Latest Study Finds No Link Between Testosterone Supplements, Heart Attack
- Anemia Treatments Don't Boost Recovery From Brain Injury, Study Finds
- Testosterone Products Must Warn About Risk of Venous Clots: FDA
- Pros, Cons to Dissolving Lung Clots: Study
- Study Ties Too Much Sitting to Risks for Certain Cancers
- Urine Test May Help Spot Dangerous Blood Clots
- Major Women's Health Study Paid Big Dividends
- Taking Blood Thinners With Certain Painkillers May Raise Bleeding Risk
- Rare, But Serious, Side Effect Reported With One MS Drug
- Aspirin May Not Protect Heart After Non-Cardiac Surgeries: Study
- Can Diet Soft Drinks Contribute to Heart Trouble in Women?
- Schizophrenia Linked to Pregnancy Complications, Study Suggests
- Early Promise for a Blood Thinner Without the Bleeding Risk
- Video Game Teaches Kids How to Spot a Stroke
- First-Time Cesarean Rates Dipped in 2012: CDC
- Mekinist Plus Tafinlar Approved for Late-Stage Melanoma
- FDA OKs 2-Drug Combo Treatment for Advanced Melanoma
- Death Rate After Hip, Knee Replacements Has Dropped Sharply: Study
- A-Fib Doesn't Mean You're Banished to the Sidelines
- 'Low T' Therapy: Is It for Me?
- Tretten Approved for Genetic Clotting Disorder
- Experts Lay Out Options for Menopause Symptoms
- Keeping Healthy During Holiday Travel
- Drug Arimidex Cuts Risk for Breast Cancer in Older, High-Risk Women: Study
- Estrogen Won't Make Women Sharper After Menopause, Study Finds
- Lengthy Car, Plane Rides Pose Risk of Clots
- Studies Suggest Better Approaches to Staying Clot-Free
- Antidote Might Reverse Complication From Blood Thinner Pradaxa
- Estrogen After Menopause May Blunt Stress' Effects on Memory
- Non-Delivery Hospital Stay May Raise Clot Risk During Pregnancy
- Study Raises Questions About Testosterone Therapy
- Ultrasound Device May Improve Emergency Stroke Care: Study
- Antibiotic-Resistant Infections Up Among Hospitalized Kids: Study
- Less-Skilled Weight-Loss Surgeons Often Have Higher Complication Rates: Study
- Laparoscopic Surgery for Colon Cancer May Benefit Seniors
- Study Compares Heart Risks for 2 Hormonal Regimens
- Medical Harm Occurs in Nearly 43 Million Hospital Cases Each Year
- All-in-One Pill May Be Effective Treatment for Heart Care
- Cancer-Surgery Complications Rise While Death Risk Drops
- Rheumatoid Arthritis Increases Potential for Blood Clots, Study Suggests
- Drug Combo May Reduce Risk of Second Stroke: Study
- Aspirin Equals Pricier Blood Thinner for Preventing Clots: Study
- Blacks With Certain Gene Need Lower Doses of Warfarin: Study
- Comparing the New Blood Thinners to Warfarin
- Kcentra Approved to Stop Severe Bleeding in Heart Patients
- Men Who Are Obese While Young Can Pay a Price Later
- 'Off-the-Shelf' Artificial Blood Vessels Show Promise
- Health Highlights: April 17, 2013
- Study Pinpoints Women at Risk for Blood Clots From Pregnancy
- Certain Steroids May Raise Risk of Dangerous Blood Clots
- Study Probes Use of Filter Device to Stop Deadly Blood Clots
- Clot Buster Safe for Stroke Patients on Blood Thinners: Study
- Report Details Steps to Boost Patient Safety
- Blood Thinners May Boost Survival for Prostate Cancer Patients: Study
- New Blood Thinner Beats Older Drug for Vein Clots: Study
- Surgical Delivery of Drug Shows Promise Against 'Bleeding' Stroke
- Blood Clots During Pregnancy More Likely After IVF, Study Says
- Some Migraines Linked to Heart Attack, Blood Clots
- Blood Disorder Cases Tied to Prescription Painkiller Abuse
- Hillary Clinton Plans to Return to Work Next Week
- Weight-Loss Surgery Is New Diabetes Foe
- Doctors: Clinton Should Recover Fully From Clot
- Hillary Clinton Hospitalized With Blood Clot
- FDA: Don't Use Pradaxa Blood Thinner in Patients With Artificial Heart Valves
- New Blood Thinner May Help Prevent Leg Clots, Study Finds
- 10 Years of Tamoxifen Better Than 5: Study
- New Drug Regimens May Slow Advanced Breast Cancer
- Certain Arthritis Patients Fare Worse After Joint Replacement: Study
- Medical Group: Sell the Pill Without Prescription
- Standard Dose of Blood Thinner May Not Be Best for All Patients
- Xarelto's Approval Expanded
- Post-Flight Fainting May Signal Dangerous Blood Clot: Study
- Panel Advises Against Hormones to Prevent Disease
- As Armstrong Case Unfolds, Experts Describe Doping's Harms
- Hormone Therapy May Benefit Some Women's Hearts
- Tomatoes May Lower Your Risk for Stroke
- Postoperative Program Prevents Respiratory Complications: Study
- Hormone Therapy in Early Menopause May Benefit Some Women: Study
- Rheumatoid Arthritis May Be Linked to More Blood Clots
- New Anti-Clotting Drug Beats Warfarin, Study Says
- Seniors Who Fell Recently May Fare Worse After Surgery
- 'Half-Match' Marrow Transplants Help Some With Sickle Cell
- Study Assesses Blood Thinner Use After Gastrointestinal Bleeding
- Mechanical Blood Clot 'Retrievers' May Aid Stroke Patients
- Knee and Hip Replacement Surgeries Linked to Heart Attacks
- Clot-Busting Stroke Drug Safe for Many Who Take Warfarin
- Even Brief Ozone Exposure May Raise Fatal Heart Risk: Study
- FDA Delays Decision on Blood Thinner Eliquis
- FDA Rejects New Use for Blood Thinner Xarelto
- Some Diabetics May Not Benefit From Daily Aspirin
- Bariatric Surgery May Help Diabetic Kidney Disease
- Quick-Reversal Method May Be at Hand for New Blood Thinner
- Many Suffer Leg, Lung Clots While Hospitalized: CDC
- Heart Rhythm Disorder May Raise Older Women's Stroke Risk
- Aspirin May Prevent Recurrence of Deep Vein Blood Clots
- Clot Buster Seems to Help Up to 6 Hours After Stroke
- New Blood Thinner May Lower Chances of Clots in High-Risk Heart Patients: FDA
- FDA Issues Warning on Controversial MS Treatment
- Clot-Buster Doesn't Raise Bleeding Risk in Warfarin Patients: Study
- Blood Clot Risk Linked to Some Non-Pill Contraceptives
- Rate of Hospitalizations for Stroke Has Declined in U.S.
- Fish Oil Doesn't Cut Failure Rate of Hemodialysis Grafts
- Blood Clot Risk for Outpatients Needs More Attention: Study
- Stopping Blood Thinners Raises Stroke Risk for Patients With Irregular Heartbeat
- New Warning for Some Birth Control Pills
- Infection Might Raise Blood Clot Risk for Older Adults: Study
- Treating Clogged Veins Improves MS, Study Says
- Clot-buster Drug Injection Might Help Some Heart Attack Patients
- Bacteria From Mouth Can Lead to Heart Inflammation: Study
- Varicose Veins Keep Some in Long Pants All Year
- Aspirin as Good as Plavix for Poor Leg Circulation: Study
- Avoid Window Seats to Cut Risk for In-Flight Blood Clots: Study
- Many Stroke Victims Still Don't Get Treated Fast Enough: Study
- Aspirin, Warfarin Fare Equally for Heart Failure Patients
- Being Fit Before Stroke May Aid Recovery
- Clot-Busting Drug May Work for Those Who Have Strokes While Asleep
- Experimental Drug Might Beat Aspirin in Preventing Repeat Strokes: Study
- Hip Fracture Patients Often Have Other Health Problems
- Knee, Hip Replacements Carry Blood Clot Risk
- New Blood Thinner Linked To Higher Heart Attack Risk
- Doubt Cast on Use of Genetic Test Before Plavix
- Adding Lovenox Didn't Reduce Blood Clot Death Risk in Study
- Low Iron Levels May Increase Blood Clot Risk
- Aspirin May Reduce Risk of Repeat Blood Clots
- Procedure May Lower Complications After Leg Clots
- Some Causes of Stillbirth May Be Avoidable: Studies
- Cancer Outpatients at Greater Risk for Blood Clots
- Health Tip: Help Protect Against Blood Clots
- FDA: Stronger Labeling Needed for Newer Contraceptives
- Low-Dose Aspirin After Lung Clot Could Prevent Recurrence
- FDA Panels to Weigh Safety of Newer Forms of the 'Pill'
- FDA Rejects Avastin for Breast Cancer
- Newer 'Pill' May Raise Blood Clot Risk
- Inflammatory Bowel Disease Tied to Higher Risk of Post-Op Blood Clots
- Health Tip: Managing Pain After Surgery
- Chocolate May Cut Women's Stroke Risk
- Heart Attack Complications More Likely for Women Smokers
- New Warning Added to Avastin Label
- FDA Advisory Panel Backs Xarelto to Prevent Strokes
- Anti-clotting Drug Warfarin May Be Safe for Elderly
- Ultrasound of Neck Predicts Who Will Have a Stroke
- FDA Investigates Newer Birth Control Pills
- Take Steps to Prevent Pulmonary Embolisms
- Many Strokes Occur in Sleep, Preventing Treatment
- Coumadin Recalled Over Potency Concern
- Estrogen-Only HRT Not So Risky in 50s
- 'Mini-Strokes' May Increase Risk of Heart Attack
- New Drug Helps Patients With Atrial Fibrillation
- Rare Form of Stroke Affects Young People
- FDA Rejects New Blood Thinner -- for Now
- FDA Moves to Pull Avastin Breast Cancer Approval
- Aromatase Inhibitors May Raise Heart Risks
- Alcohol Associated With Lower Risk of Arthritis
- Many Stroke Patients Don't Get Quick Treatment