Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek urgent or emergency help for:
Seek prompt medical advice if you are pregnant or planning pregnancy and think you may be folate deficient.
Also request timely assessment for numbness, pins and needles, problems with balance, confusion, or memory changes because these can suggest vitamin B12 deficiency or another neurological condition.
These symptoms do not automatically mean folate deficiency, but they can occur with severe anaemia or another condition needing urgent assessment.
Arrange a routine appointment if you have persistent tiredness, unexplained weakness, a sore tongue, repeated mouth ulcers, or breathlessness during activities that were previously comfortable.
Assessment is also appropriate if you have risk factors such as coeliac disease, bowel surgery, heavy alcohol use, a restricted diet, or a medicine that affects folate.
Every sign above is quoted from the sofidex article on Folate deficiency. If you are not sure, err upward — it is always reasonable to be checked.