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uk Health & medical scares severe thirst suddenly • always thirsty new • peeing a lot suddenly • frequent urination new • waking up to pee at night • rapid weight loss unexplained • losing weight without trying • thirsty and weight loss • thirst and frequent urination • possible high blood sugar symptoms • diabetes symptoms sudden • new sugary urine concern • very dry mouth constant • blurred vision with thirst • extreme fatigue with thirst • nausea with thirst and urination • fruity breath concern • confusion very sleepy sudden • dehydration signs sudden • urgent same day blood test

What to do if…
you develop new severe thirst and frequent urination with unexpected weight loss

Short answer

Get same-day medical assessment for possible dangerously high blood sugar (including new-onset diabetes). If you feel very unwell (vomiting, severe drowsiness/confusion, trouble breathing), go to A&E or call 999.

Do not do these things

  • Do not “wait a few days to see if it settles” if the thirst/urination and weight loss are new and severe.
  • Do not deliberately stop drinking to reduce urination (this can worsen dehydration).
  • Do not try to “treat it yourself” with leftover diabetes medicines, insulin, diuretics (“water tablets”), or extreme dieting.
  • Do not do intense exercise if you feel unwell, very dehydrated, or dizzy.
  • Do not drive yourself to urgent care if you feel faint, confused, or very sleepy.

What to do now

  1. Check for emergency warning signs right now. Call 999 or go to A&E if any apply:
    • vomiting or you can’t keep fluids down
    • severe tummy pain, fast/deep breathing, or breath that smells “fruity”
    • confusion, unusual drowsiness, or you’re hard to wake
    • signs of severe dehydration (very dry mouth, dizziness on standing, minimal urine)
  2. If you are not in immediate danger, get same-day help:
    • Call NHS 111 and say: “New severe thirst, peeing a lot, unexpected weight loss — I’m worried about high blood sugar/diabetes.”
    • If you can reach your GP practice quickly, ask for an urgent same-day assessment (but don’t delay if they can’t offer one).
  3. If you have a home glucose meter (yours or a family member’s), check a blood sugar now.
    • If it’s high and you feel unwell (or you’re getting worse), treat it as urgent and follow step 1 or NHS 111 advice.
  4. If you already have ketone testing supplies (blood ketone meter or urine ketone strips), check ketones.
    • Blood ketones over 3.0 mmol/L or urine ketones over 2+ is an emergency: call 999 or go to A&E.
  5. While you’re arranging care:
    • Sip water regularly (unless a clinician has told you to restrict fluids).
    • Write down: when symptoms started, estimated weight change, how often you’re peeing (especially overnight), any fever/illness, and any medicines (including steroids).
  6. Bring practical info to the assessment (or have it ready on the phone):
    • NHS number (if known), current meds, allergies, pregnancy status (if relevant), and any history of diabetes in you or close family.

What can wait

  • You do not need to decide “what type of diabetes it is” right now.
  • You do not need to start a special diet, stop eating completely, or do a cleanse.
  • You can postpone non-urgent commitments until you’ve been assessed and you’re safe.

Important reassurance

These symptoms can be frightening, and it’s reasonable to treat them as urgent. Getting checked promptly is the safest move, and many causes are treatable once identified.

Scope note

This is first-step guidance for the next hours/day to reduce risk and get you to appropriate care. Ongoing treatment and diagnosis decisions come after proper testing.

Important note

This guide is general information, not a diagnosis. If you feel severely unwell, rapidly worsening, or unsafe to travel alone, call 999 or go to A&E.

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