Patients with high platelets may show symptoms of microvascular dysfunction and thrombosis. 1. Microvascular dysfunction: high platelet level leads to blood viscosity causing blood vessel obstruction, resulting in symptoms of microvascular dysfunction such as headache, dizziness, and abnormal sensation in limbs. 2. Thrombosis: high platelets can increase the risk of thrombosis, for patients who are suffering from hypertension, hyperglycemia, hyperlipidemia and other diseases, platelet elevation is more prone to thrombotic diseases, especially for elderly patients. Due to large individual differences, there are also differences in the symptoms of patients with high platelets. If you find high platelet on examination, you should consult a doctor for a clear diagnosis and take appropriate treatment measures.