Pain is rather unpleasant, but it can be quite a motivator. This song doesn't deal with physical pain, but the emotional kind, often caused by a breakup.
In a 2018 interview with Joan Armatrading, she told Songfacts: "'No More Pain' is about, in the end, saying, Okay, that's the situation, it's up to me now to decide, am I going to live in that pain, whatever that pain is, or am I going to say, 'Snap of it, you have the power to do something different?' Because you have the power to make those changes and you don't have to stay in certain states. You can get yourself out of it.
I know people might listen and think, 'Oh, yeah, of course you can, everything's really easy,' but I do believe that you can talk yourself into things, and in a positive way. Most of my songs are very positive. Throughout my career they tend to be very positive."