Primary concern will be whether you have lifted any heavy weight recently or have been in an intense gym training. It might lead to spasm in your muscles. Which is the reason why you will have pain in certain in specific positions and not when you are touching it
Next Steps
Apply hot water bag over the area for 10-15 minutes, 3 times a day
If you are work profile is sedentary, try to do warm exercises every 1 hour, while working
While sleeping on bed make sure you use a pillow of optimum height (niether thin, nor thick) and a semi-soft pillow
Health Tips
Be careful while applying hot water bag, monitor the temperature properly first by your hand and then apply at the area you are experiencing pain. Sometimes the skin of the affected area might get more sensitive which can result in burns due to extreme temperatures.