Arm pain, numbness or tingling can have a few different causes.
One would be that an intervertebral disc inside the spine has bulges or herniated and is pressing on the nerves that innervate the arms/hands.
Another cause could be tightness of chest and/or neck muscles that create thoracic outlet syndrome which can cause arm/hand pain, numbness and tingling.
Both of these conditions have an underlying weakness and structural issue that can absolutely be corrected, given the right advice and care.
The problem these days is that people are misdiagnosed, mistreated and misguided; leading to a disaster that they may not be aware of at first but have to deal with later in life.
Read more about cervical disc herniations here.
Read more about thoracic outlet syndrome (TOS) here.