Pain at the inner side of the elbow is mostly considered to be caused by muscle strain, medial epicondylitis of the humerus, elbow-tube syndrome, cervical spondylosis and other causes. 1. Muscle strain: Chronic strain of local muscles caused by trauma, improper exercise or heavy lifting will cause muscle pain on the inner side of the elbow. 2. Epicondylitis of the humerus: also known as golf elbow, mostly caused by frequent excessive elbow flexion, resulting in aseptic inflammation of the tendon at the epicondyle of the humerus at the stopping point, resulting in localized pain. 3. Elbow tube syndrome: due to osteophytes or tendon sheath compressing the ulnar nerve causing nerve edema and ischemia, causing pain on the inner side of the elbow joint, numbness of the arm, ring finger and little finger, and other symptoms. 4. Cervical spondylosis: degeneration of cervical vertebrae can radiate to the medial elbow pain, and some of them are accompanied by numbness of the upper limbs. There are many reasons for the pain at the inner elbow, if the rest does not relieve, or the pain is serious, you should consult a doctor in time to clarify the cause of the disease for treatment.