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 Weight Loss Help Sciatica Pain?
Yes, weight loss can help reduce sciatica pain, particularly when excess weight is putting pressure on the sciatic nerve. Carrying extra weight places additional stress on the lower back and spine, which can aggravate nerve compression and pain. If you have a BMI in the overweight or obese range and experience sciatica, losing weight through diet, physical activity, and in some cases prescription weight management options available in the UK may help relieve symptoms and improve mobility. Your GP can advise on the best approach for your individual situation.
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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 Helps Sciatica — The Connection
Sciatica occurs when the sciatic nerve becomes compressed or irritated, usually in the lower back. Excess weight increases pressure on the spine and surrounding structures, which can trigger or worsen sciatica pain. Losing weight reduces this mechanical load on your back and pelvis, allowing the nerve to decompress naturally.
Research shows that people with obesity experience higher rates of sciatica and chronic back pain than those at a healthy weight. Even a 5–10% reduction in body weight can significantly reduce lower back pain and sciatic nerve irritation. Combined with targeted exercise and physical therapy recommended by your GP, weight loss offers a practical, sustainable path to pain relief.
This is why NHS weight management services often recommend weight loss as a first-line approach for sciatica-related pain in people with excess weight. Our free BMI calculator above can help you check whether excess weight may be contributing to your symptoms.
Clinically BackedWeight Loss
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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.
Prescription Weight Management Options in the UK
For people with a BMI of 30 or above, or 27 or above with weight-related health conditions including joint or back pain, prescription weight loss medications are available in the UK. Licensed options include Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) — all approved for weight management when used alongside diet and exercise.
Access to these medications is through NHS specialist weight management services (which may have waiting lists) or private prescribing after a clinical assessment. Our GLP-1 weight loss calculator can help estimate potential weight loss outcomes. Always speak with your GP first about whether prescription weight loss treatment is appropriate for your sciatica and overall health.
- 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 weight loss completely supports sciatica?
Weight loss can significantly reduce or resolve sciatica pain, particularly when excess weight is the primary cause. However, sciatica can also result from disc herniation, spinal stenosis, or muscle tightness — not just weight. Your GP can assess the underlying cause and advise whether weight loss alone will help, or if additional treatment like physical therapy is needed alongside weight management.
How much weight do I need to lose to feel sciatica relief?
Many people experience pain reduction with just a 5–10% loss of body weight. For someone weighing 100kg, this means losing 5–10kg. However, individual results vary depending on the cause and severity of your sciatica. Your GP or physiotherapist can discuss realistic goals for your situation.
Are weight loss injections safe if I have sciatica?
Weight loss injections like Mounjaro and Wegovy are prescription-only medications suitable for eligible adults. They are not contraindicated by sciatica itself, but your prescriber will assess your full medical history. Always inform them about your sciatica pain so they can ensure the medication is appropriate for you.
What's the best way to lose weight with sciatica pain?
A combination of reduced-calorie intake, low-impact exercise (swimming, walking, cycling), and physical therapy works best. Your GP can refer you to NHS weight management services or a physiotherapist who can design a pain-safe exercise programme. Some people benefit from prescription weight loss medication alongside lifestyle changes — discuss this with your GP.
How long does it take for weight loss to help sciatica?
Most people notice pain improvement within 4–8 weeks of consistent weight loss and appropriate exercise. This varies depending on the severity of your sciatica, how quickly you lose weight, and whether you're also doing targeted stretches or physiotherapy. Keep your GP updated on your progress.
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.