Feeling Cold, Taste Changes, Hair Shedding: Common GLP-1 Side Effects Explained
What side effects should I expect from semaglutide or tirzepatide?
Published September 2, 2026
Key takeaways
- GI symptoms — nausea, constipation, diarrhea, burping, reflux — are the most commonly reported side effects and tend to cluster around dose increases.
- Feeling unusually cold, taste changes, and hair shedding are reported often enough to be worth naming, even though they get less attention than GI effects.
- Hair shedding is more closely associated with rapid weight loss in general than with the medication's mechanism specifically, and is usually temporary.
- Persistent vomiting, inability to keep food or water down, or severe abdominal pain are not 'normal adjustment' — message your provider.
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The GI symptoms most people expect
Nausea is the side effect most associated with GLP-1 and GIP/GLP-1 medications, and it's most noticeable right after a dose increase — which is exactly why titration schedules step up gradually instead of starting at a maintenance dose. Constipation, diarrhea, burping, and reflux are also commonly reported, and tend to follow the same pattern: more noticeable around a dose change, easing as the body adjusts.
Simple things that often help: eating smaller meals, slowing down while eating, reducing fatty or heavily processed food right after a dose increase, and staying ahead of hydration.
The side effects that get less attention
- Feeling unusually cold. Some patients report increased cold sensitivity, particularly as body fat decreases — body fat plays a role in temperature regulation, so this tracks with the physiological change, not just the drug itself.
- Taste changes. Food tasting different, a metallic taste, or reduced interest in foods you used to enjoy is a reported pattern, likely tied to the same appetite-signaling pathway the medication acts on.
- Hair shedding. Increased shedding a few months into treatment is a real, reported pattern — but it's more closely linked to rapid weight loss and reduced calorie intake generally (a pattern called telogen effluvium) than to the medication's mechanism specifically. It's the same kind of shedding sometimes seen after any fast weight change, illness, or major dietary shift, and it's usually temporary.
- Fullness after a few bites. Feeling full quickly, sometimes after eating very little, is one of the intended appetite effects — but if it's severe enough to affect adequate nutrition, that's worth discussing with your provider rather than pushing through.
What's worth messaging your provider about
Mild versions of the above are part of the expected adjustment period. What isn't expected: persistent vomiting or an inability to keep food or water down, signs of dehydration, or severe abdominal pain. Those are reasons to message your care team promptly — see our guide on who actually reviews those messages for what to expect when you do.
Frequently asked
Is hair shedding a direct side effect of the medication itself?+
It's more commonly linked to rapid weight loss and reduced calorie intake than to the drug's mechanism directly — a pattern called telogen effluvium, which can follow any fast weight change regardless of the method. It's usually temporary and tends to resolve as weight stabilizes.
When does GI discomfort typically improve?+
For most people, nausea and other GI symptoms are most noticeable right after a dose increase and tend to ease as the body adjusts to that dose over the following days to weeks. This is a core reason titration schedules increase gradually instead of jumping straight to a maintenance dose.