Back problems are a common issue that many people go through. If you have strained your back, your muscles will feel sore, achy, tight, and painful. With movements, the pain can also worsen. You can also experience muscle cramps or spasms, where your muscles contract by themselves. You may not be able to sit straight without feeling a stiff sensation in your back. The pain can also be felt near your butt if you strain your lower back. These symptoms can last from 3 to 4 weeks, but they can be cured in days if it’s mild.