Thrombocytosis may be a condition during the excessive variety of platelets within the blood. Platelets are blood cells in plasma that stop harm by protruding along to make a clot. Too several platelets will cause bound conditions, together with stroke, heart failure, or a clot within the blood vessels. Platelets are blood particles created within the bone marrow that plays a vital role within the method of forming blood clots. Symptom may be a disorder during which your body produces too several platelets. There are two kinds of thrombocytosis, primary and secondary. Primary symptom, conjointly referred to as essential thrombocythemia, may be a sickness during which abnormal cells within the bone marrow cause a rise in platelets. The cause is unknown. Most patients do not have Associate in Nursing symptoms of an exaggerated living substance count. Once symptoms do seem, they will embody skin bruising or harm from numerous areas like the nose, mouth, and gums, or the abdomen and enteral tract. Abnormal clotting may occur, resulting in stroke, heart failure, and weird clots within the blood vessels of the abdomen. Some patients with essential thrombocythemia develop erythromelalgia, inflicting pain, swelling, and redness of the hands and feet, moreover as symptom and tingling.