Are there other causes for uneven floors? 

Yes, aside from foundation settling and degradation of floor joists, uneven floors can also arise due to other issues such as termite damage, poor construction, plumbing leaks, or natural disasters that have affected the ground stability. In some older homes, uneven floors may be a result of prolonged natural settling over time. It is essential to have a professional identify the exact cause to ensure that the appropriate solution is applied to fix the uneven floors.