Try to avoid frequent heavy lifting. If this is part of your job seek professional help for advice about back strengthening exercises. Take regular exercise. One of the best forms of exercise, for overcoming back problems, is swimming. Keep your weight down to the acceptable limits for your height.
Excess weight puts a lot of additional strain on the back.
For women, high heeled shoes can be a major contributor to back ache. Do not smoke. There is a well documented relationship between the frequency of back troubles and smoking. If the pain is severe or chronic and long lasting, always consult your physician. Delay in doing so can result in the problem getting worse.