Having too many platelets in the blood is a sign of either thrombocytosis or thrombocythemia. Thrombocytosis is a response to an infection or a disease in the bone marrow or blood, while thrombocythemia is more likely to... More »

A high platelet count can be caused by a bone marrow condition that produces too many platelets, a separate disease, or another condition that affects platelet count, according to the National Heart, Lung, and Blood Inst... More »

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Symptoms of a high platelet count include headache, bleeding, feeling weak, and numbness in the hands or feet, states Healthgrades. Blood-clotting symptoms, including nausea, seizures, dizziness, difficulty breathing and... More »

High platelets are classified as either primary thrombocythemia, which can be inherited but does not have another known cause, and secondary thrombocytosis, which can be a symptom of another condition such as anemia, blo... More »

www.reference.com Health Medical Ranges & Levels

Better Medicine states that high platelet production is categorized as either primary thrombocythemia, which occurs for reasons unknown, or secondary thrombocytosis, which is caused by another condition, such as infectio... More »

Effects of a high blood platelet count, or thrombocytosis, can include stroke, heart attack and blood clots due to blood vessel blockage, according to the Cleveland Clinic. After thrombocytosis has been in an individual'... More »

An elevated platelet count generally means one of two things: reactive thrombocytosis or essential thrombocythemia. Reactive thrombocytosis means that an underlying condition has elevated the platelets, while essential t... More »

www.reference.com Health Medical Ranges & Levels