When the blood supply of the inflammatory area of the shoulder joint is less, the inflammatory metabolites can not be transported away, diluted and decomposed quickly.The higher the concentration in the local area,the stronger the stimulation to the pain nerve.At the same time, as the concentration of these metabolites increases,the more severe the local swelling and stasis,the stronger the tension and compression,so the pain in the lesion area will be aggravated at night.
Second, the influence of night environment on patients is small:during the day, patients' attention is distracted by work, study and interpersonal communication, while the influence of night environment on patients is small.Patients' attention is more likely to focus on shoulder pain, so they feel that the pain at night is more obvious.
Third, long time compression of tissues around the shoulder joint: when sleeping at night, the patient's posture is fixed, and the shoulder joint capsule or other tissues around the shoulder joint may be compressed or stretched for a long time, resulting in pain.
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