Sudden swelling and pain in a single finger is commonly caused by infection, allergy, trauma, tenosynovitis and arthritis.
1. Infection: may be in contact with bacteria or viruses triggered by inflammation, manifested by swelling and pain in the finger, increased skin temperature, oozing and so on.
2. Allergy: It is presumed that the contact with allergenic substances, finger swelling and pain accompanied by itching, reddening and so on.
3. Trauma: mainly refers to finger fractures and tendon ruptures caused by cuts, strains, etc. Typical symptoms are swelling and pain in a single finger, loss of finger sensitivity, and limitation of finger movement.
4. Tenosynovitis: It is common in manual laborers and housewives, and is a sterile inflammation of the tendons that govern the fingers due to strain. Typical symptoms include swelling of a single finger, pain on pressure, and popping when moving the finger.
5. Arthritis: can be cartilage degeneration caused by osteoarthritis, also includes gouty arthritis, manifested as finger joints swelling, pain, redness and limited activities.
If the swelling and pain affects hand movement or spreads to other fingers, it is recommended to consult a doctor in time.