Symptoms of insect bites and stings. An insect bite or sting often causes a small lump to develop, which is usually very itchy. A small hole, or the sting itself, may also be visible. The lump may have an inflamed (red and swollen) area around it that may be filled with fluid. This is called a weal.
Hormones and the Brain. That's not to say estrogen isn't a major player in regulating moods. Estrogen acts everywhere in the body, including the parts of the brain that control emotion. Some of estrogen's effects include: 1  Increasing serotonin, and the number of serotonin receptors in the brain.
The Hormones that affect Depression. There are several hormones that play a part in depression. The relationships between hormones and depression in women include: Estrogen: Boosts serotonin, which helps fight depression and promotes sleep. It also increases GABA, the calming neurotransmitter and raises endorphins, which help you feel good. Low estrogen levels often found in menopause can cause feelings of sadness and hopelessness.