Why You Might Be Feeling Cold on Wegovy

Step 1: Understand why Wegovy can make you feel cold

When semaglutide reduces your appetite, your body takes in fewer calories. A calorie deficit is exactly the point — but the body interprets sustained energy restriction as a signal to conserve, and one of the first things it conserves is heat. This is sometimes called adaptive thermogenesis: your resting metabolic rate dips modestly in response to weight loss, and you generate less body warmth as a result.

There is also a straightforward physical explanation. Fat beneath the skin acts as insulation. As you lose adipose tissue, that insulating layer becomes thinner, and you feel ambient temperature more acutely. It is the same reason lean individuals tend to feel the cold more than those with a higher body-fat percentage. Both mechanisms can overlap during Wegovy treatment, particularly in the first few months when weight loss is most rapid.

The semaglutide medicines page covers the broader physiological picture if you want to understand how the medicine works. Feeling cold is listed among the more commonly reported experiences on Wegovy, and the NHS semaglutide patient information notes that it can occur alongside other adjustment effects.

Step 2: Rule out causes that need a conversation with your GP

Cold intolerance that is severe, worsening, or accompanied by other symptoms deserves medical attention, because occasionally it points to something unrelated to Wegovy. An underactive thyroid (hypothyroidism) causes cold sensitivity, fatigue and weight changes, and it is worth checking if the sensation is pronounced. Anaemia can also reduce your tolerance to cold, and it is not unusual for iron levels to shift during periods of significant dietary change.

Dizziness alongside cold feelings is worth noting too. If you are experiencing dizziness on Wegovy, dehydration is the most common cause, and staying well hydrated helps both dizziness and temperature regulation. If something feels disproportionate or unlike the gradual onset you would expect, report it to your prescriber or GP rather than waiting for your next review.

None of this is cause for alarm in most cases. The key distinction is between a steady, mild feeling of being colder than before (which is almost certainly adaptive) and sudden, severe cold intolerance that comes with other new symptoms.

Step 3: Practical steps to stay comfortable

The most effective thing most people do is simply dress in more layers. It sounds obvious, but the impact of thinning insulation is real, and a thermal base layer makes a measurable difference on colder mornings. Many people find that keeping a jumper at their desk becomes routine, the same way some keep a spare brolly.

Eating enough protein matters too. Adequate protein supports lean muscle mass, and muscle is metabolically active tissue that generates heat. If appetite suppression is significant, a focus on protein-dense meals before anything else can help maintain your resting heat output. Staying physically active serves a similar purpose: even a short walk raises core temperature and counteracts the adaptive metabolic slowdown.

The early satiety that Wegovy causes can mean some people undershoot calories further than intended. If that resonates, raise it with your prescriber at your next review, they may adjust your dose or suggest specific dietary support. You can read more about how Wegovy affects how you feel day to day on the full guide to how Wegovy makes you feel.

Wegovy also has a counterpart effect that affects some people in the opposite direction: if you are curious about feeling hot on Wegovy, that page explains why flushing and warmth occur for some patients. Temperature responses on this medicine vary person to person.

Step 4: Know when it typically resolves

For most people, the cold sensation is most noticeable during the phase of fastest weight loss, usually the first three to six months. As weight stabilises at a new set point, the body adapts its thermogenic baseline and many people report the feeling fading. It rarely persists indefinitely at the same intensity.

If you are exploring treatment or want to understand what to expect more broadly, the Wegovy overview covers the full picture, from eligibility to the titration schedule. And if you are at the stage of considering how to access treatment through a regulated UK prescriber, you can read about the prescription process here. The clinical team at our pharmacy reviews every consultation personally, a real prescriber, not an automated system, reads your health information and makes the decision.

Wegovy is a prescription-only medicine. Whether cold intolerance or any other symptom prompts a question, the right place to raise it is with your prescriber rather than adjusting your dose or schedule on your own.