
What Causes Tingling And Numbness In Back With Upper Limb Weakness?

Also have to wait another 3 months to see a neurologist.
How worried should I be?
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Detailed Answer:
I read your question carefully and I understand your concern.
If by worrying you mean a life threatening condition which needs urgent evaluation then I would say no, the evolution doesn't indicate issues like stroke, abscess, not in the absence of other signs at least. The lipoma in the back shouldn't have to do with it as nerves for the upper limb leave from the cervical spine.
On the other hand, conditions which develop slowly, but are still serious and need attention may be responsible for those sensory changes and motor deficit (weakness) of the upper limb. Such conditions include multiple sclerosis, or some slowly growing spinal tumor. A neurological exam is necessary and probably an MRI. 3 months might be an acceptable delay if only that, but I wonder if the neurologist asks for more imaging tests whether their scheduling might nit take a couple of additional months which might be too much waiting.
So some sort of evaluation is needed. If the neurologist visit can't be anticipated then a primary physician should still perform a neurological exam. Might not be as experienced as neurologist, but still can check basic changes in motor strength in other limbs, sensation, reflexes, balance and coordination, which would give some orientation on whether there is more extensive involvement. In that case urgent admission might be necessary, otherwise if no other signs waiting and monitoring till the appointment.
I remain at your disposal for further questions.

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