Morning finger swelling may be due to tenosynovitis, rheumatoid arthritis and trauma. 1. Tenosynovitis: tenosynovitis is a kind of sterile inflammation, usually due to strain, the patient will appear local joint pain, pressure pain, and activity restriction, and sometimes there will be localized swelling, swelling will be more obvious in the morning after getting up. 2. Rheumatoid arthritis: Rheumatoid arthritis can also lead to swelling of the fingers in the morning, and the patient will also experience joint stiffness, pain and swelling of the joints. 3. Trauma: when sleeping at night, improper sleeping posture can lead to finger extrusion or pressure injury, resulting in poor blood circulation or soft tissue damage, resulting in finger edema. Clinically, there are also renal edema, cardiogenic edema, hepatic edema, endocrine causes of edema, etc., which may lead to swelling of the fingers in the morning. Osteoarthritis can also affect the fingers with morning stiffness and swollen fingers. It is recommended to carry out blood tests, blood sedimentation, rheumatoid factor and other tests to clarify the diagnosis. Swollen fingers in the morning may also be other causes, to the hospital in time, clear diagnosis for treatment.