The short explanation
Losing weight without trying is worth getting checked, and it is usually explained by something other than cancer — an overactive thyroid, diabetes, depression, stress, digestive problems or an infection such as tuberculosis. A useful rule is that losing around five percent of your body weight over six to twelve months without meaning to deserves a visit. The same applies to other changes that last: a lump that does not go away, a cough or hoarseness beyond three weeks, blood where there should not be any, a change in bowel habit, difficulty swallowing, or a sore that does not heal.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- What matters is change from your normal and persistence. Most people with these symptoms do not have cancer; checking early is how both the common causes and the rarer serious ones get treated sooner.
- Before the appointment, it helps to note how much weight you have lost and over what time, and any other symptoms such as fever, night sweats, appetite or bowel changes.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you what is causing your weight loss or tiredness, or what tests you need. Only an examination and tests can do that.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- What are the likely causes of my weight loss, and what tests would you start with?
- Should my thyroid, sugar and blood count be checked?
- Could this be tuberculosis or another infection?
- If the first tests are normal and it continues, what next?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
- Get emergency care now (call 112 or 108) for vomiting blood, black tarry stools, severe abdominal pain, or being unable to swallow liquids.
- See a clinician within days to two weeks for unexplained weight loss, a lump that persists, blood in urine or stool, difficulty swallowing, or a cough with night sweats or fever lasting more than two to three weeks.
Sources
The evidence this explanation is built on.
- Unintentional weight loss NHS
- Cancer — signs and symptoms NHS
- Weight loss — unintentional MedlinePlus (US National Library of Medicine)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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