Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Tendinitis ?
    ### Response:
    Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon.    Tendinitis usually happens after repeated injury to an area such as the wrist or ankle. It causes pain and soreness around a joint.
    