What causes stiff and tight arm muscles?

Generally speaking, stiff and tense arm muscles may be caused by factors such as cold exposure, poor posture, prolonged inactivity after fractures, cervical spondylosis, or hypothyroidism. If discomfort occurs, timely medical consultation is recommended. Specific analyses are as follows:

Cold exposure: Patients who engage in heavy physical labor over a long period and fail to keep their arms warm may frequently experience cold-induced arm muscle inflammation. This can lead to aseptic inflammation, muscle adhesion, and impaired blood circulation in the arms, resulting in a sensation of stiffness. It is important for patients to maintain proper warmth, dress appropriately according to weather changes, and avoid cold exposure.

Poor posture: Prolonged sitting during office work or driving, especially when maintaining forward-stretched or downward-hanging arm positions, can cause sustained muscle tension—particularly in muscles such as the biceps brachii and deltoid. This reduces blood circulation and leads to accumulation of metabolic waste, potentially forming muscle nodules. It is recommended to stand up and move the arms every hour, performing stretching exercises such as chest expansions and arm raises to help relieve symptoms.

3. Prolonged inactivity after fractures: If a patient's arm suffers a fracture due to direct or indirect trauma, immobilization of the affected limb is usually required to prevent secondary injury. Limited movement during recovery may result in stiff and hardened muscles due to prolonged immobilization. After initial healing, patients can begin rehabilitation exercises under medical guidance, gradually increasing physical activity.

4. Cervical spondylosis: Common symptoms of this condition include neck and back pain, weak upper limbs, numb fingers, and leg weakness. If left untreated, compression of corresponding nerve roots may impair nerve conduction and reduce nutritional and blood supply to arm muscles, leading to muscle stiffness. Patients are advised to take medications such as nabumetone capsules or Shujin Huoxue tablets under a doctor’s supervision.

5. Hypothyroidism: Insufficient thyroid hormone secretion leads to reduced metabolic rate and mucinous edema, causing fluid accumulation between muscle cells. This manifests as muscle stiffness, fatigue, and soreness, often accompanied by cold intolerance, weight gain, and dry skin. Patients may be prescribed medications such as levothyroxine sodium tablets, thyroid tablets, or methylprednisolone tablets under medical guidance.

In daily life, it is important to develop healthy habits and enhance immunity through appropriate physical activities such as running, jumping rope, and swimming, which contribute positively to overall health.