Semaglutide effects may curb hunger, while nausea remains common.

Less hunger may come with an upset stomach

Semaglutide began with Novo Nordisk's work on the body's after-meal hormone, and the medicine may curb hunger by slowing a meal's trip through your stomach, though that same delay can cause nausea. You'll find two kinds of facts here. Personal accounts tell you what one person noticed, but those accounts can't establish the cause. Study findings come next, each with a source number.

Many users describe smaller meals and lower weight. Nausea is mentioned most, often near the start or soon after the amount rises. Some people notice thinner hair after quick weight loss. The rapid change itself could be more important than the drug. I'd bring your pill bottles and the date each problem began. This page can't name the cause of your symptom. Dosage research context gives study plans, not a diagnosis.

Many users say hunger and cravings become easier to manage

People taking semaglutide have shared these accounts in public groups. These are things users said, not results from researchers testing one group against another. Each claim remains untested. One person's report may suggest something to ask about; it still doesn't prove the cause. You won't find an amount to take here.

What users say changed

• Hunger eases and food takes up less thought in many reports. Some notice this in the first week or two. They may be satisfied with less food, and portions may shrink by a third to a half. A few call the relief profound.
• Cravings feel weaker in many reports. Candy, greasy meals, or rich food may lose their appeal. Some even find those foods unpleasant. Lighter choices such as fruit and vegetables may become easier.
• Weight goes down in most reviews. Users often describe steady loss for several months, then a slower spell. They'll often credit smaller meals.
• Blood sugar improves in some reports from people with type 2 diabetes. Some see lower readings, including on the test that looks back about three months. Others report steadier energy.
• Alcohol seems less appealing to some people. A few lose interest in drinking and certain foods. One person's account still can't tell us why.

These Semaglutide side effects appear most in user reports

These semaglutide side effects also come from public groups. They're personal reports, not findings from a study that compared groups. Researchers haven't tested every claim. Some match known results, but the two lists aren't alike.

• Nausea, sometimes with vomiting, leads the reports. Nausea appears in about a third; fewer mention vomiting. Trouble is often worst near the start or just after an increase. Some feel better within a week or two. Rich or fatty meals may make it worse. Small bland meals and water come up often.
• Bad-smelling burps are common too. People liken the smell to spoiled eggs. They may start after an increase and last for hours or weeks. Some people feel bloated, as if food has sat too long.
• Constipation or diarrhea may happen at different times in the same person. Constipation means hard bowel movements that come less often. Rich meals may worsen diarrhea. Eating very little may worsen constipation.
• Heartburn or acid rising may come with burping or a swollen belly.
• Tiredness early on appears often in these reports. It may begin the day after a shot, or perhaps the next day, then fade.
• Changes in food, taste, and smell may make fatty or meaty foods unappealing. Some report a metal taste or sharper sense of smell. A few must remember to eat.
• Hair shedding and a leaner face may show after a few months. Users often link both to quick weight loss. Most call the shedding brief.
• Headache and dizziness may follow not eating or drinking enough. Some notice this during the first few days after an increase.
• A sore injection spot may itch or leave a tender bump or red patch. This list can't identify your problem.

Studies confirm stomach trouble and point to rare dangers

The points below draw on both studies and safety reports. You'll see a source number beside every fact.

Stomach and bowel trouble, mainly after an increase. Nausea, vomiting, loose stools, and constipation caused most people who quit to stop. One large study found that the trouble usually wasn't severe and didn't last long ^[16]. In one safety review, about one person out of three had nausea ^[5]. Reports from everyday care also focus on the gut ^[17]. Since the drug delays a meal leaving your stomach, this trouble makes sense. You'll want to ask which signs can't wait.

An uncommon form of thyroid cancer. Drugs that copy the gut hormone called GLP-1 carry a strong warning because rodents developed tumors ^[18]. Studies in people haven't linked semaglutide clearly to thyroid cancer ^[18]. Doctors avoid it if you or close family had this uncommon cancer. They also avoid it with a rare type 2 disease that can lead to tumors in hormone-making glands ^[5]. You'll need your doctor to check whether either family history applies to you.

Pancreatitis, a sudden swelling of the pancreas. These GLP-1 medicines carry that warning too. A doctor often stops the medicine when swelling is suspected. One review couldn't settle the pancreas cancer question because there were very few cases ^[5]. The warning calls for care, but it doesn't prove added risk or give a diagnosis.

Some risks need more care as you get older

Gallstones. One safety review found more gallbladder trouble with semaglutide than with placebo, an inactive treatment ^[5]. The rapid weight loss itself could account for much of the difference. Still, later reports and studies both found the rise. You'll want to ask which pain high in your belly can't wait.

Eye trouble tied to diabetes. The SUSTAIN-6 study found more of this trouble with semaglutide. A 95% range showed how far the estimate might vary ^[2]. Those at greatest risk already had eye damage, and their blood sugar fell quickly. How fast sugar falls could matter more than the medicine itself. You may have an eye check as the reading comes down ^[5].

Muscle loss. A small part of a weight study found that muscle accounted for some lost pounds ^[9]. A large, quick loss can weaken you, which matters more with age. Researchers are studying protein and strength work. The study found less muscle, but it didn't test later effects on daily life.

Weight returning. In the STEP 1 follow-up, people regained about 11.6 percentage points on average within one year ^[19]. Some earlier health gains faded too. In STEP 4, weight rose after study staff changed patients to placebo ^[20]. You may need long-term care because this isn't a cure.

Hair loss during fast weight loss. One review found more reports with semaglutide and tirzepatide ^[21]. A skin study tied scalp-wide, short-term shedding to the amount lost and the pace of loss ^[22]. That points toward weight change, not direct harm from the drug.

Pregnancy. During pregnancy, approved labels say semaglutide isn't used. After about one week, one-half remains. Nearly all has left about five weeks after use ends. The label tells patients to stop about two months before planning a pregnancy ^[15].

Pills that need a very exact amount in your blood. GLP-1 medicines slow the stomach. One review found few major problems with other pills. Still, too much or too little of some medicines can be harmful ^[14]. You'll need a doctor or pharmacist to say whether any of your pills need extra checks. Bring every bottle to the visit.

Longer studies led to more uses over time

Novo Nordisk built semaglutide as a copy of a gut hormone called GLP-1. The makers also blocked a cutting chemical called DPP-4, which made one weekly shot possible ^[15]. The FDA first approved the medicine for type 2 diabetes in 2017. The daily pill came in 2019-2020, followed by weight care in 2021. Heart results arrived in 2023 ^[3], and kidney results came in 2024 ^[6]. Uses tied to that work arrived in 2024 and 2025. Another study led to a 2025 use for a serious fatty liver disease ^[24]. A federal shortage ran from about 2022 through early 2025. Some pharmacies made semaglutide then. Officials ended the shortage in early 2025; compounded semaglutide remains subject to legal limits and a clinician's decision for each patient. Those dates can't tell which use fits you.