Female ill be 30 on june.its been 3 weeks with neck pain.. it gets worse when i look down or stare at my phone.. im worry this can be something serious. its been cracking a lot since the pain started.pain goes away when i lie down in bed or sleep?

Neck strain: The most common cause of a stiff neck is a muscle strain/soft tissue sprain. It may also be accompanied by a headache, neck pain, shoulder pain and/or arm pain. In most cases, pain and stiffness go away naturally within a week. Persistent neck pain may indicate a postural bad habit. Try to elevate your computer screen or lift your phone up so your neck is not angled down. Use ice to ease pain.