Many mental-health professionals believe that a biochemical imbalance in the brain plays a key role in depression.* The imbalance may be passed on genetically, for researchers have found that teens with a parent who suffers from depression are more likely to develop the condition themselves.
Wataalamu wengi wa afya ya akili wanaamini kwamba kukosekana kwa usawaziko wa kemikali katika ubongo huchangia sana mshuko wa moyo.* Kutokuwa na usawaziko kunaweza kupitishwa na chembe za urithi, kwa kuwa watafiti wamegundua kwamba vijana walio na mzazi ambaye ana mshuko wa moyo wana uwezekano mkubwa wa kupatwa na ugonjwa huo wenyewe. .