Yes, psilocybin mushrooms can make you feel cold. It’s one of the more common physical side effects, and it happens for real physiological reasons, not just because you’re anxious. The sensation typically peaks around 30 minutes after ingestion and fades within about an hour, though it can linger depending on the dose.
Why Shrooms Affect Your Body Temperature
Psilocybin works primarily by activating serotonin receptors in your brain. Serotonin plays a major role in regulating body temperature, and when psilocybin floods those receptors, it can directly interfere with your body’s internal thermostat.
Research in mice has shown that the temperature effect is dose-dependent but not straightforward. At very low doses, psilocybin slightly raised core body temperature (by about 0.7°C). At higher doses, it did the opposite, dropping core temperature by roughly 1.3°C. This flip appears to involve different serotonin receptor subtypes. When researchers blocked a specific serotonin receptor (the 5-HT1A receptor), the temperature drop reversed and turned into a temperature increase, suggesting that receptor is a key player in the cooling effect.
Thermal camera imaging of mice given psilocybin confirmed a dose-dependent decrease in body temperature that appeared around 17 minutes after dosing, hit its lowest point at about 30 minutes, and resolved by 70 minutes. The animals also actively avoided cooler surfaces and showed a strong preference for warmer ones, which mirrors what people describe: feeling cold and wanting blankets or warmth.
Vasoconstriction and Cold Hands
Beyond the brain’s thermostat, psilocybin also affects your blood vessels. As a serotonin receptor activator, it causes vasoconstriction, meaning your blood vessels narrow. This raises blood pressure (clinical studies consistently show increases to around 138-155/83-93 mmHg during psilocybin sessions) and reduces blood flow to your extremities.
When less warm blood reaches your fingers and toes, they feel cold. This is the same mechanism behind cold hands on a stressful day, but psilocybin amplifies it. The result is that even in a warm room, your hands and feet can feel noticeably chilly, sometimes accompanied by tingling or numbness.
Anxiety and the “Come Up” Factor
The onset phase of a mushroom trip, often called “coming up,” is when most physical discomfort concentrates. Your body is adjusting to a sudden shift in brain chemistry, and many people experience a burst of anxiety during this window. That anxiety triggers your sympathetic nervous system, the same fight-or-flight response that sends blood away from your skin and toward your core organs. Psychedelic research has documented increased cold sensitivity alongside transient anxiety as common acute effects.
This creates a feedback loop. You feel cold, which makes you more physically uncomfortable, which feeds the anxiety, which makes the cold sensation worse. The good news is that this loop typically breaks on its own as the peak effects settle in and the initial anxiety fades.
Higher Doses, Stronger Effect
The chilling effect scales with dose. In animal studies, researchers found that mice given higher doses of psilocybin showed significantly more avoidance of cool surfaces compared to controls, while lower doses produced little change. The actual drop in core temperature was also more pronounced at higher doses. This lines up with what most people report: a gram or two might produce mild coolness, while a larger dose can bring on full-body shivers.
One interesting detail from the research is that this temperature disruption may also reduce sensitivity to cold-related discomfort at very high doses. Mice given 10 mg/kg of psilocybin showed fewer pain responses to cold stimulation than those given lower doses. So at higher doses, your body gets colder, but you might paradoxically notice it less because of the drug’s effects on pain and sensory processing.
How to Stay Comfortable
Since the cold feeling is a genuine physiological response and not just in your head, physical warmth is the most effective solution. Have blankets readily available before you start. Layers of clothing you can easily add or remove are ideal because some people alternate between feeling cold and feeling overheated, sometimes sweating profusely during the same experience. Warm socks help specifically because your feet are most affected by the reduced blood flow.
Room temperature matters more than you might expect. Setting your space a few degrees warmer than usual can prevent the worst of the chills. Warm (not hot) beverages like herbal tea serve double duty: they raise your core temperature slightly and give you something grounding to hold onto. Participants in psychedelic research sessions have described things like feeling the warmth of a fire or wrapping up in blankets as genuinely helpful anchors during uncomfortable moments.
The cold sensation is almost always temporary. It tends to be strongest during the first 30 to 60 minutes and usually resolves well before the psychological effects wear off. Knowing this can help you ride it out rather than letting the discomfort spiral into worry about something being wrong.