Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Thrombocythemia and Thrombocytosis ?
    ### Response:
    People who have thrombocythemia or thrombocytosis may not have signs or symptoms. These conditions might be discovered only after routine blood tests.
                
However, people who have primary thrombocythemia are more likely than those who have secondary thrombocytosis to have serious signs and symptoms.
    