There are two general causes of finger swelling: one is localized and the other is systemic. The most common cause of finger swelling may be localized, such as in trauma; finger trauma can lead to localized inflammation, swelling and pain when the finger is injured, at this time the patient will have finger swelling, based on the history of the cause of the disease can be clearly defined. Localized swelling is also seen in local inflammation, such as rheumatoid arthritis, early scleroderma and local blood circulation disorders, can cause localized swelling sensation. In addition, attention should also be paid to the investigation of systemic causes, in addition to the above rheumatic localization, some systemic causes are usually seen in cardiogenic, hepatic, renal edema; this case of edema is often in the sagging parts, in the end of the limb swelling at the same time, the nearby parts of the swelling may be more obvious, based on the history of the disease, and thus the cause of the disease can be easily identified. In addition, the application of certain medications or allergic diseases can also cause swelling of the fingers.