Likely cause
It can be due to various reasons. What do you actually mean by weakness in nerves. Because if you say weakness means there is peripheral neuropathy and the nerve affected is not getting nerve signals or stimulation Because of which the related muscles are not working properly.
If you are just getting tingling sensation or itching type of sensation or any other nerve related pain or neck stiffness or back pains type of stuff then it might be due to nerve problems which can be due to:-
Increased blood sugar levels. Like for example high blood sugar level patients most commonly get nerve problems like sciatica Because of the sciatic nerve getting affected.
Sometimes it is due to nutritional deficiency like vitamin b complex or vitamin D which are crucial for nerve health.
What to watch for
Persistent tingling.
Spreading numbness.
Extreme sensitivity.
Clumsiness
Balance issues.
Unable to talk or walk.
Unexplainable sweating or urination.
What you can do
Best is to visit your nearest Physician or if you want more detailed checkup, kindly see a Neurologist.
Till then eat right and keep away any stress
Keep your BP and sugar in level
When to see a doctor
If any of the symptoms i mentioned is present. Do not worry, get yourself checked and do what's required.
Take care. Get well soon.
This is general information from a verified doctor and is not a diagnosis or a substitute for an in-person consultation. In an emergency, seek immediate medical care.