A low number of platelets in the blood. Platelets, also called thrombocytes, are colorless blood cells that stop bleeding in blood vessel injuries.

Thrombocytopenia is caused by conditions or medicines that affect the circulation, production or destruction of blood platelets. If platelet level becomes too low, there's a risk of serious bleeding after an injury or during surgery. Rarely, dangerous internal bleeding can occur.

Symptoms may include excessive bruising, a rash that looks like tiny dots on the skin, excessive bleeding from minor injuries, bleeding from the gums, nosebleeds, blood in urine or stool, and unusually heavy menstrual flows. Some people will have no symptoms.

Treatment usually includes stopping the medicine or treating the disease that caused thrombocytopenia. Other treatments may include medicines to protect platelets or transfusions of donor platelets.

Self-care options include avoiding activities that could cause injury, drinking alcohol in moderation, if at all, and using caution with pain relievers available without a prescription, such as aspirin and ibuprofen.

Seek medical care immediately if there is:

• Uncontrolled bleeding.

Make an appointment to see a health care professional if there is:

• Easy bruising.
• Prolonged bleeding from cuts.
• Rash of pinpoint-sized spots, usually on lower legs.
• Bleeding from gums or nose.
• Blood in urine or stool.