Thumb and Index Finger Intersection Pain

Pain at the intersection of the thumb and index finger is generally attributed to tenosynovitis, also known as finger flexor tenosynovitis in medicine, commonly referred to as trigger finger or snapping finger. There are many reasons for this condition, with the most common being strain on the connected joint areas. Generally, local heat application can help alleviate the pain. Let's briefly understand what causes pain at the intersection of the thumb and index finger:

1. What Causes Pain at the Intersection of the Thumb and Index Finger? The clinical presentation is commonly known as "stenosing tenosynovitis," which is mainly caused by excessive activity of the thumb. Overuse of the thumb's extensor tendons can lead to a "dumbbell-shaped" change in the tendons, causing pain and even "embedding," which is commonly known as the state of a "trigger finger." It is recommended to rest, apply local heat, and the condition will gradually improve.

2. Symptoms and Signs: The onset of the condition is usually gradual and commonly seen in individuals who engage in household chores and manual labor, especially older women. Any finger can be affected, but the thumb, middle finger, and ring finger are the most commonly affected. The main symptoms include localized pain on the palmar side of the metacarpophalangeal joint and limited finger movement. As the tenosynovitis narrows and the tendons are compressed, they may bulge in a gourd-like shape, making it difficult or impossible for the bulging part to slide. When passing through the narrow tenosynovium, the finger may become locked in a straightened or flexed position. During examination, a nodular mass can be felt at the tender point on the patient's metacarpal bone, and the nodular mass can be felt to slide during finger flexion and extension, but it is often obstructed due to tenosynovial narrowing. Continued effort may suddenly cause the nodule to slide past, accompanied by a snapping sensation or painful bouncing, hence the nickname "trigger finger," "snapping finger," or "twitching finger." Diagnosis can be made based on the history, clinical symptoms, and signs, particularly the presence of the snapping sensation characteristic of a trigger finger.

3. How to Prevent Trigger Finger:

• Alternate hands when sending text messages to prevent overuse of the thumb on one hand.
• Hold the phone with both hands to balance the pressure on both hands.
• Avoid pressing the keyboard with excessive force or for extended periods with the thumb.
• Avoid grasping heavy objects with your hands.
• Perform simple hand exercises to eliminate fatigue after sending text messages or engaging in handwork for a period of time.