What is the cause of swelling and pain in the back of hand?

This unexplained swelling is mostly functional edema.

Functional edema can be divided into the following situations:

● High-temperature edema When working in hot summer or high temperature, sometimes mild edema of lower limbs or hands may occur. This may be due to thermal stimulation, which leads to the expansion of blood vessels on the body surface, the increase of arterial blood flow or the expansion and stagnation of superficial veins, leading to the increase of capillary overpressure, and the infiltration of body fluids into the interstitial space of loose connective tissue under the skin to form mild edema, which is easy to occur in feet and hands.

● Postural edema, also known as traveler edema, is found in people who walk or stand for a long time. After some people walk for a long time, venous return of lower limbs will be affected, capillary exudation will increase, forming edema of lower limbs; Some people still need to work for a long time, so that the venous return of lower limbs is blocked, resulting in edema of lower limbs.

● Obese edema is more common in obese women, and edema is located in lower limbs. The reason is that obese people have increased subcutaneous fat, blood vessels are easy to expand, leading to blood stasis, and edema will occur when venous pressure of lower limbs increases. Obese people should strengthen physical exercise and lose weight properly, and edema will naturally disappear.

● About 25% of women with premenstrual edema may have edema before menstruation 10 ~ 14 days, and most of them are mild edema of lower limbs. In severe cases, facial and hand edema may occur, often accompanied by restlessness, insomnia, headache and breast pain. With menstrual cramps, urination increases and symptoms gradually disappear. A few patients will have edema during menstruation or after menstrual cramps.

● edema of pregnant women in the third trimester of normal pregnancy. Because the enlarged uterus compresses the inferior vena cava, the blood return is blocked, and mild edema of lower limbs often occurs. However, it subsided after rest, with no urine protein and low blood pressure, which can be distinguished from the symptoms of pregnancy poisoning.

● Edema in the elderly often occurs when the heart, liver and kidney function decrease and the permeability of blood vessel wall increases.