### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I started having lower back pain on one side 3 weeks ago. The last week, it feels like it s been spreading to both sides, hips and buttocks. For the last 4 days I ve had almost flu like symptoms, as well. Sore throat, ear ache, headache, general biody aches. The flue like syptoms seem to come and go

### output:

Dear User, Thank You for choosing Chat Doctor, I do understand Your concern. There are many people that experience back pain as part of flu symptoms, but You explained that you had it before the flu. In your case what happened is that you used to suffer from back pain (chronic or acute, I will explain later), and the flu incarcerated it, so made it worse. When the flu will go away (consider Ibuprofen, paracetamol, home remedies for treatment), the back pain will release or will get at the phase that was before you had the flu. If you had this back pain in one side for the first time of your life only three weeks ago, please remember if you injured your hips, or if you are doing exercise that stress your back, or if you are staying fitted in one place for too long. If none of the causes mentioned above is not true, then I would suggest a urinalysis to check the condition of your kidneys.Meanwhile, I would recommend some topical anti-inflammatory cream to relieve the back pain and also any heating pad, or specific belts which you can find in Chat Doctor. I did this explanation to clarify you that your back pain did not cause the flu and there is any other reason beyond these two conditions. The back pain, in your case was strengthen by the flu, and will go on after if you are not accidentally hurt or stressing your back. To make it go away follow my instructions mentioned above. I wish You all the best,