Although a fever technically is any body temperature above the normal of 98.6 F (37 C), in practice, a person is usually not considered to have a significant fever until the temperature is above 100.4 F (38 C). Fever is part of the body's own disease-fighting arsenal; rising body temperatures apparently are capable of killing off many disease-producing organisms.

Arthritis is inflammation of one or more joints. When joints are inflamed they can develop stiffness, warmth, swelling, redness and pain. There are over 100 types of arthritis, including osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis, lupus, gout, and pseudogout.

Headaches can be divided into two categories: primary headaches and secondary headaches. Migraine headaches, tension headaches, and cluster headaches are considered primary headaches. Secondary headaches are caused by disease. Headache symptoms vary with the headache type. Over-the-counter pain relievers provide short-term relief for most headaches.

Headaches are a common complaint for many people. There are many types of headaches such as migraine, tension, cluster, and the general run of the mill headache. These 17 natural home remedies such as:

• Exercise
• Meditation
• Hydration
• Yoga
• Caffeine
• Essential oils such as lavender and butterbur
• Herbs
• Vitamins like magnesium

Foods also can trigger headaches. Histamine releasing foods (for example, preserved foods, canned meats and beans, alcohol, and shellfish); tyramine-rich foods, for example, aged cheeses and meats, beer, and red wine; and foods high in salt also can trigger headaches.

If you're plagued with headaches, our Headaches Quiz may help you identify causes, triggers, symptoms, and treatments for headache pain caused by different types of headaches such as migraines, sinus, cluster, tension, or stress.

Itching can be a common problem. Itches can be localized or generalized. There are many causes of itching to include: infection (jock itch, vaginal itch), disease (hyperthyroidism, liver or kidney), reactions to drugs, and skin infestations (pubic or body lice). Treatment for itching varies depending on the cause of the itch.

Migraine headaches are severe headaches that are sensitive to light, sounds, and smells. Some people who suffer from migraines also have severe head pain. People also have symptoms of nausea and vomiting. Common migraine triggers may include:

• Certain foods
• Dehydration
• Changes in barometric pressure
• Stress
• Other phenomenon

They are diagnosed by a doctor if the headache pattern fits established migraine headache criteria. Over-the-counter (OTC) and prescription medications are sometime used to treat acute migraines. To prevent or reduce the frequency and severity of them doctors recommend supplements and prescription medications, for example:

• Blood pressure drugs
• Anti-seizure drugs
• Antidepressants

Lifestyle modification helps in migraine management. Many people who suffer from migraines get relief from their condition by keeping a headache diary, identifying and avoiding triggers, and taking appropriate medication.

What does a migraine feel like? Discover the difference between headaches and migraines. Learn to spot migraine symptoms early, how to identify your triggers, and get more information on migraine medications and treatments.

Psoriasis is a long-term skin condition that may cause large plaques of red, raised skin, flakes of dry skin, and skin scales. There are several types of psoriasis, including psoriasis vulgaris, guttate psoriasis, inverse psoriasis, and pustular psoriasis. Symptoms vary depending on the type of psoriasis the patient has. Treatment of psoriasis may include creams, lotions, oral medications, injections and infusions of biologics, and light therapy. There is no cure for psoriasis.

The scalp may have fine, dry, scaly skin or have heavily crusted plaque areas. See a picture of Psoriasis of the Scalp and learn more about the health topic.

Take the mystery out of psoriasis. Take the Psoriasis Quiz and see what you know about the types, symptoms, treatments and more.

What is psoriasis? Explore psoriasis treatment options such as topical ointments, phototherapy, natural remedies and more. Learn about psoriasis symptoms, causes and treatment. View psoriasis pictures of different types of nail, plaque, and scalp psoriasis.

Rheumatoid arthritis (RA) is an autoimmune disease that causes chronic inflammation of the joints, the tissue around the joints, as well as other organs in the body. Because it can affect multiple other organs of the body, rheumatoid arthritis is referred to as a systemic illness and is sometimes called rheumatoid disease.

Regular exercise boosts fitness and helps reverse joint stiffness for people with rheumatoid arthritis (RA). Our experts offer helpful exercises to get you started.

What is rheumatoid arthritis (RA)? Learn about juvenile rheumatoid arthritis. Discover rheumatoid arthritis (RA) symptoms, diagnosis, and treatment.

How is rheumatoid arthritis different from other forms of arthritis, such as osteoarthritis and gout? Take the Rheumatoid Arthritis (RA) Quiz to rest your RA IQ.

Scalp psoriasis causes red, raised, scaly patches that may extend from the scalp to the forehead and the back of the neck and ears. Symptoms and signs include itching, hair loss, flaking, silvery scales, and red plaques. Treatment includes topical medicated shampoos, creams, gels, oils, ointments, and soaps, medications, and light therapy.