Tendinitis is most commonly seen in the wrist or metacarpophalangeal joints. Typically, patients will experience redness, swelling, heat, and tenderness in the wrist, along with limited joint mobility. It is usually recommended that patients rest and avoid overexertion. Due to repeated friction caused by overexertion, swelling of the annular ligament or tendon sheath can occur. This leads to insufficient circulation of synovial fluid within the joints, and excessive friction can cause damage to the tendons and tendon sheaths, resulting in chronic inflammation and swelling. This is how tendinitis develops. Repetitive tasks, such as flipping a spoon at the wrist or cooking, can cause pain, with the most common being de Quervain's tenosynovitis, which can be confirmed by physical examination. Activities like wringing a towel or cooking can lead to pain. When necessary, treatments such as injections or small needle knife therapy may be required. Rest can relieve most symptoms, but there is a high chance of recurrence. Attention should be paid to wearing wrist braces and applying local heat can help.