The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Does Mounjaro Help With Joint Pain?
Joint pain is often closely linked to excess weight, and many people wonder whether Mounjaro (tirzepatide) can help ease pain in knees, hips, and ankles. The answer is indirect but meaningful: Mounjaro itself doesn't directly treat joint pain, but by supporting weight loss, it may help reduce the strain and pressure on joints. Since carrying extra weight places stress on weight-bearing joints, losing even 5–10% of your body weight can lead to noticeable improvement in joint discomfort. In the UK, accessing Mounjaro involves understanding both NHS and private routes, which vary significantly in cost and availability.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Weight Loss Affects Joint Pain
The relationship between weight and joint health is well established. Excess weight places additional stress on joints, particularly the knees, hips, ankles, and lower back. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — a prescription-only injection that supports weight loss by helping regulate appetite and food intake. In clinical trials, Mounjaro helped people lose an average of 15–21% of their body weight, though individual results vary significantly.
When you lose weight through Mounjaro alongside a reduced-calorie diet and increased physical activity, the reduced load on your joints may lead to decreased pain and improved mobility. Research shows that a 5% reduction in body weight can meaningfully ease joint pain. However, Mounjaro is not a pain medication — it works by supporting sustainable weight loss, and any joint pain improvement follows as a secondary benefit. Your GP or a licensed prescriber can assess whether Mounjaro is appropriate for your individual health situation and help you explore realistic expectations around symptom improvement.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Mounjaro Cost & Access in the UK
NHS access: Mounjaro is approved by NICE for specialist weight management services, but availability varies significantly by region. Most NHS access is through tier 3 or tier 4 specialist services, typically reached via GP referral. Waiting lists can be substantial in many areas.
Private access: A Mounjaro KwikPen is available through private online consultations with UK-licensed prescribers. Costs typically range from £150–£320 per month depending on your dose and the prescribing provider. You'll need a valid UK prescription, which is issued following an online clinical assessment. Private prescribing provides faster access without NHS waiting lists, though you pay out of pocket. Always ensure any provider is GPhC-registered.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Can Mounjaro directly reduce joint pain?
No — Mounjaro doesn't directly treat joint pain. It's a weight loss medication that supports appetite regulation. However, by helping you lose weight, Mounjaro may indirectly reduce strain on joints, potentially easing pain over time. Any improvement in joint symptoms follows weight loss, not from the medication itself.
How much weight loss is needed to feel joint pain relief?
Research suggests that even a 5–10% reduction in body weight can meaningfully improve joint pain and mobility. With Mounjaro, average weight loss in clinical trials was 15–21% of body weight over several months, though individual results vary. Your GP can discuss realistic timelines based on your situation.
How much does Mounjaro cost on prescription in the UK?
Through the NHS, Mounjaro is free if prescribed via specialist tier 3 or tier 4 services, but access is limited and waiting times vary by region. Private prescriptions typically cost £150–£320 per month depending on your dose and provider. Costs are higher at lower starter doses and decrease per unit at higher maintenance doses.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Both are once-weekly injections licensed for UK weight management. Clinical trials showed Mounjaro achieved slightly higher average weight loss (up to 21% vs 15% for Wegovy), though individual results vary. Your prescriber will assess which is more suitable for you.
Can I check my weight loss progress and joint pain improvements with free tools?
Yes — MyWeightCheck offers a free GLP-1 weight loss calculator to help estimate projected weight loss at different Mounjaro doses, plus our free progress tracker to log your weight changes over time. Tracking your weight loss alongside your joint pain symptoms can help you see the connection between the two and stay motivated throughout your treatment.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.