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Stop fasting if you develop severe dizziness, feel close to fainting, become confused or markedly weak, start shaking, have vision changes, nausea, severe thirst, very dark urine, unusual palpitations, or chest pain. Seek emergency care for chest pain or pressure, trouble breathing, a seizure, loss of consciousness, significant confusion or drowsiness, or fainting with an abnormal heartbeat, speech or vision problems, weakness, injury, or slow recovery. If someone is unconscious or cannot swallow safely, give them nothing by mouth and call your local emergency number.
When to stop the fast and get prompt medical advice
Stop the fast rather than trying to push through symptoms that may signal dehydration, low blood sugar, or significant fatigue. Warning signs include:
- Severe dizziness or feeling close to fainting
- Confusion, marked weakness, or shaking
- Blurred or otherwise changed vision
- Nausea, severe thirst, or very dark urine
- Unusual palpitations or chest pain
Dubai Health Authority’s 2026 Ramadan guideline advises stopping immediately if symptoms may indicate dehydration, low blood sugar, or extreme fatigue. Its warning is presented in guidance about intense exercise while fasting, so it is not a personalized assessment of every fasting situation. The Saudi Ministry of Health also describes dehydration symptoms during Ramadan, including dry mouth, lethargy, poor concentration, excessive sleepiness, muscle cramps, dizziness, confusion, and fainting (Ramadan Fasting and Dehydration).
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Seek prompt clinical advice if symptoms are significant, persist, or do not improve quickly after stopping. Children, older adults, people with diabetes or kidney disease, pregnant or breastfeeding people, and people who exercise in the sun may be at higher risk of dehydration. Fever, vomiting, diarrhea, increased urination, and diuretic use also raise concern, according to the Saudi Ministry of Health guidance linked above.
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When to call emergency services
Call your local emergency number for symptoms that could indicate immediate danger, including:
- Shortness of breath, or chest pain or pressure
- Loss of consciousness or a seizure
- New or significant confusion, unusual drowsiness, or difficulty waking
- Fainting accompanied by chest discomfort, an abnormal heartbeat, trouble speaking or seeing, limb weakness, an injury, or delayed return to alertness
These warning signs are consistent with Singapore Ministry of Health emergency advice and MedlinePlus guidance on fainting. Singapore’s emergency number applies only in Singapore; use the appropriate local number wherever you are (Singapore Ministry of Health; MedlinePlus: Fainting).
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If you have diabetes: follow your plan and check glucose
Symptoms of low or high blood sugar can overlap with feeling unwell for other reasons. If you have diabetes, stop fasting and follow the fasting and sick-day instructions agreed with your clinician; check your glucose if you can. The Saudi Ministry of Health’s Ramadan diabetes guidance recommends breaking the fast in these circumstances:
- Glucose below 70 mg/dL
- A recheck within an hour in the 70–90 mg/dL range
- Glucose above 300 mg/dL
- Symptoms of high or low blood sugar, dehydration, or acute illness
These are that ministry’s Ramadan recommendations, not a substitute for individualized medical advice. See its guidance on high and low blood sugar in Ramadan, and use your clinician’s own thresholds if they differ.
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What to do if low blood sugar is suspected
For a conscious person who can swallow safely, Mayo Clinic advises taking about 15 grams of fast-acting carbohydrate and checking glucose again after 15 minutes. Glucose tablets are one option. Follow any personal treatment plan provided by a clinician (Mayo Clinic: Hypoglycemia diagnosis and treatment).
Do not give food, drink, or tablets by mouth to someone who is unconscious or cannot swallow safely. Call emergency services if severe hypoglycemia is suspected. The National Health Service also lists shaking, sweating, dizziness, confusion, and visual changes among possible low-blood-sugar symptoms (NHS: Low blood sugar).
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
