Cabin fever is the depressing feeling of being couped up for months and the desire to see sun, and any temp above freezing. The disorder SAD and even historial tales of otherwise inexplicable murder are are associated with Cabin Fever.
Spring fever is the feeling that you want to be outdoors and do everything at the same time once spring actually breaks , like now for us. When you're young it works but as you age your out of shape winter body can't handle it and you wind up as sore as I was yesterday, but still ready to garden, golf and walk 5 miles today . (Well mentally ready) LOL