There are many causes of worsening neck pain.
Well, you can get neck pain for straining your neck but it shouldn't stick around for weeks. If it does it's important you consult a doctor.
Reasons why someones neck may hurt:
- Slipped discs.
- Cancers/, etc which correlates with the spine.
- Stiff from having your neck in a certain position.
If the pain continues, talk to a doctor for further evaluation. In most cases it isn't severe, or something that can't be delt with. In some cases it's serious.