
What causes fluid accumulation in the tendon sheath?
Disease description:
Recently, there has been swelling on my hand, with pain upon pressing, although not severe. The doctor mentioned it is still tenosynovial effusion. I would like to ask what causes tenosynovial effusion?

The formation of tenosynovial effusion is closely related to various factors such as trauma, chronic strain, infection, and other diseases.
1. Trauma: Injuries such as sprains and falls may damage the tendon sheath, leading to inflammatory reactions and fluid accumulation.
2. Chronic strain: Prolonged repetition of the same motion or excessive joint use, such as extended computer use or manual labor, may damage the tendon sheath and result in fluid accumulation.
3. Infection: Microbial infections, such as those caused by bacteria or viruses, may lead to tendon sheath inflammation and increased synovial fluid secretion, resulting in fluid accumulation.
4. Other diseases: Conditions such as rheumatoid arthritis and gout may cause fluid imbalance within the tendon sheath, leading to fluid accumulation.