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 care if symptoms return or worsen, particularly shortness of breath, rapid swelling, fainting, confusion, new difficulty walking, or repeated vomiting that prevents fluids and food from staying down.
Follow-up helps confirm that symptoms are improving and that the underlying cause has been addressed.
The timing depends on how severe the illness was.
A person treated in the hospital may need early review, while someone with a milder deficiency may be monitored through scheduled outpatient visits.
At follow-up, the clinician may reassess strength, walking, sensation, swelling, breathing, weight, and heart rate.
Blood tests may be repeated when they are useful for monitoring nutrition, magnesium, or other abnormalities.
Persistent heart symptoms may require cardiology care, while ongoing numbness or weakness may require neurology or rehabilitation services.
Stable, gradually improving symptoms can usually be discussed at the next planned visit unless the treating clinician has advised otherwise.
The article also says
Long-term prevention should focus on the specific cause.
This might involve nutritional support after bariatric surgery, treatment for chronic vomiting or malabsorption, help with alcohol use, or access to reliable food.
Pregnant or breastfeeding people with restricted intake or prolonged vomiting should discuss nutrition with their maternity care team.
Every sign above is quoted from the sofidex article on Beriberi. If you are not sure, err upward — it is always reasonable to be checked.