Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of High Blood Cholesterol ?
    ### Response:
    High blood cholesterol usually does not have any signs or symptoms. Many people don't know that their cholesterol levels are too high. Who Should Be Tested Everyone age 20 and older should have their cholesterol levels checked at least once every 5 years. If your cholesterol level is high, you will have to be tested more often.
    