Despite safety concerns, people take blackthorn flower to treat colds, breathing conditions, cough, fluid retention, general exhaustion, upset stomach, kidney and bladder problems, and constipation; and to treat and prevent stomach spasms. Some people use it to cause sweating. Blackthorn flower is also an ingredient in some "blood cleansing" teas.
Blackthorn berry is used as a mouth rinse (gargle) for mild sore throat and mouth. The syrup and wine of the blackthorn berry are used for emptying the bowels and increasing urine production to relieve fluid retention (as a diuretic). A marmalade made from the berry is used for upset stomach.
Some people apply blackthorn flower directly to the skin for rashes, "skin impurities," and "blood purification."
In foods, blackthorn flower is used in herbal teas as a coloring agent.
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