Vomiting..ahh..ahh most unwanted event. Yeah, it’s possible that pain mostly leads to nausea and that sickly feeling is what makes vomit. And the reasons you vomit while in severe pain is because your body and its nervous system are acting on high alert to keep you alive.
Actually, severe pain makes you vomit but the scientists are facing difficulties in finding exactly mechanism links of pain and vomiting. They have some possible outcomes, one of which involves hormones like adrenaline.
Since you are in severe pain, you are also most likely be subjected to shock, which plays a role in your sympathetic nervous system by causing organs such as the adrenal gland to release hormones which can raise HR, BP, and respiration.
Adrenaline is the one that gets your heart pounding before a first date or a big race and it’s also released when you’re in pain. By speeding up your breathing and heart rate adrenaline can prepare your body to escape a potential threat.
While preparing this hormone activates a bunch of receptors throughout your body including one type called alpha-adrenergic receptors which might be specifically responsible for the pain induced vomiting.
This hasn’t been directly tested in humans but in some animals activation of these receptors can cause neurons to fire in a brain region called “Area Postrema”, commonly known as the vomiting center.
When you’re in a ton of pain that flood of adrenaline could activate a bunch of these alpha receptors and therefore your vomiting center.
While vomiting itself has some pretty clear-cut mechanisms the causes of nausea are still poorly understood. It is really tough to study because unlike pain nausea is more than just a physical signal it’s a full-on physical psychological and even emotional experience. It’s possible that pain mostly leads to nausea and that sickly feeling is what makes vomit.