If I need to have medical care in a state that taxes do I need to file a part year state tax return? I had no wage earnings in that state?

[DG]

I did have wages early in the year (Jan, Feb, Mar) in my home state that does not tax but did not receive any wage earnings later in the year in this other state where I needed to seek medical care.

[DoninGA]

If you had no income that was sourced in the other state then you do Not file a tax return for that state.

[DG]

What are about other forms of regular income such as SSA income, US Federal pension, RMDs, dividends, interest earned, etc.?

[JulieS]

It depends on whether your changed your residence to the new state, or simply stayed there for medical purposes. If you never intended to remain in the new state and you didn't take action to change your state residency, and didn't earn wages there, you are considered a full year resident of the original state. 

Actions that establish state residency include:

• Getting a driver's license.
• Registering to vote with your new address.
• Buying a home and applying for a homestead exemption (does not apply to all states).
• Changing your mailing address for utilities, banking, etc.
• Obtaining a registration for your car and pets.