Serotonin doesn’t make us happy. It’s a signaling chemical used by our nerves. In people with depression, *often* they find lower levels of serotonin. But that isn’t always true.
Serotonin also seems to have a role in mediating several other body systems – digestion, bone health, wound healing, sexual desire, sleep quality & regularity – not just in our mood. If we overdo the amount of serotonin in our system, that can cause problems including high blood pressure, shivering, confusion, diarrhea, and other troubles.
We try to make it better with SSRIs and other similar antidepressants.
It would be great if our systems worked that simply, but unfortunately we humans can be pretty complicated.
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