Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Peripheral Arterial Disease (P.A.D.) ?
    ### Response:
    Common Symptoms Some people with P.A.D. do not have any symptoms. Others may have a number of signs and symptoms. People who have P.A.D. may notice symptoms when walking or climbing stairs. These symptoms may include pain, aching, or heaviness in the leg muscles.
    