Back pain and muscle ache may be the precursor of lactic acid accumulation, fasciitis, myocardial infarction, cervical spondylosis and other diseases. 1. Lactic acid buildup: If you are overworked and perform heavy physical labor, back pain and muscle aches can be caused by lactic acid buildup, which can be relieved after resting. 2. Fasciitis: Fasciitis is a sterile inflammation of the fascia, which is mainly characterized by pain, muscle tension or weakness, muscle spasm, skin numbness and other symptoms, patients with back pain, muscle pain may be a precursor to fasciitis. 3. Myocardial infarction: myocardial infarction refers to myocardial necrosis caused by continuous and severe acute ischemia of the myocardium, which is mainly manifested as pain, muscle pain, left back pain, dyspnea and other symptoms, back pain, muscle pain may be a precursor to the onset of myocardial infarction. 4. Cervical spondylosis: cervical spondylosis is a clinical syndrome caused by cervical spine degeneration, which is mainly manifested as cervical and back pain, muscle stiffness, aches and pains, etc., and patients’ back pain and muscle pain may be the precursor of cervical spondylosis. It is recommended that patients seek medical examination in a timely manner to clarify the condition after targeted treatment, pay attention to rest in life, avoid strenuous exercise.