There are so many different back problems that can cause pain it would be hard to tell you what to do exactly . Pain is your body’s way of telling you something is wrong and everyone reacts and handles pain differently. It could be tight or pulled/ overused muscle related . It could be as
@Bo Eder says and be to much curve or even actually straightening of the lower or any part of your spine. It could be herniated or bulging disc related.
I’ve dealt with lower back issue since age 26( am about to be 55) from multiple work related injuries. It’s no fun . I suffer from herniations and bulging discs and with foraminal spinal stenosis from decreased disc height , nerve damage in both legs causing some muscle atrophy.
Don’t screw around with your back . A good chiropractor won’t adjust you without x rays to check for spine conditions or hairline fractures in vertebrae or at least knowing your spine history.
Without a known injury or cause you ( if able) can take an anti inflammatory in conjunction with alternating ice and heat , light easy stretches for your back( google) and walking if able all while paying attention to good body mechanics when lifting or doing anything, and walking as much as you can , comfortably. Do this until you can get in to see a spinal orthopedic and a set of x rays to see what’s going on and maybe an mri if need be down the line . X rays on their own won’t show bulges or herniations but can give an indication of that possibility due to disc height space between vertebrae If no fractures or serious issues preventing you from seeing a chiropractor I strongly recommend finding a good chiropractor and some physical therapy to address non fracture related spinal skeletal problems . I thus far have avoided surgery
( 2- maybe 3 level fusion) as was recommended by an orthopedic spinal surgeon and a spinal neuro surgeon. Every signal back issue and how it affects people is different. The same or similar problem may affect one person more severely that another . Your spine is the center of all your movement, so get a good ortho, x rays , and a chiropractor if warranted and take a pro active position toward getting it resolved . It can take a short period to get better/relief or a long period , so don’t expect overnight relief . Remember that some health issues took a long time to get to a certain point and it can take a while to address.
Here’s to hoping it’s nothing more than muscle problem or out of aligned spine or tilted vertebrae and you recover quickly . Just like our hearing health ( as in another thread here ) , our spine and overall body are important to us drummers and even everyday mere mortals
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Now go get it checked out and taken care of
. Good luck to you ! I literally feel your pain