Most people, including a lot of doctors, are not aware of this strange phenomenon. The syndrome was first described in the medical literature 2004 (https://www.projectcbd.org/cannabis-hyperemesis-syndrome). People with this syndrome suddenly suffer, after years of using cannabis, from pain in their stomach. Stomach ache, nauseau and constantly vomiting. Sometimes this can continue for days. For around 90% of the people with this problem, the best solution seems to be taking a hot bath.
Often mistaken for a gall bladder inflammation or stomach flu
Because these kind of symptoms can also be caused by other problems and not many people are aware of this syndrome, the cause of this problem is often overlooked. People easily diagnose it as a stomach flu. The big difference lies in two things. The problems start after years of using cannabis and the problems stop when you take a hot bath. People who suffer from this syndrome get the urge to take a hot bath very often, sometimes even obsessively.
Little is known about the mechanism behind the cause. But it is clear that this occurs in people who have been using cannabis for years on a regular basis. We know that THC, like CBD, suppresses the feeling you have to vomit. For many people this is a good reason to use medical cannabis for nausea, for example during chemo therapy. The syndrome seems to develop because of a paradoxical effect on the stomach and intestinal tract and the central nervous system. The effect seems to reverse, so it enhances the nausea and vomiting.(https://mens-en-gezondheid.infonu.nl/aandoeningen/105886-cannabinoid-hyperemesis-syndroom-symptomen-en-oorzaak.html#onbekend-mechanisme)
The problem disappears when people stop using THC. Some of the people can start using THC again at a later time. But there are also people who can never tolerate THC anymore after the syndrome occurred. That can be a pity when you use it on a recreational basis. However, for a person who uses THC for medical reasons it can be a real problem. There are clues that lower doses of THC can reduce the risk of this problem.
Combining CBD and THC
Also CBD can prove to be a solution. CBD itself suppresses the feeling of nausea and doesn’t contribute to the development of the syndrome. Besides this, it slows down the effects of THC. Even though there is not a lot of proof of the effects of cannabinoids, we can’t deny that many people experience some positive consequences. Combining THC and CBD reduces the risk of negative side effects and it increases the benefits of both substances.