Is it possible2have an umbilical hernia w/o a visible lump? What else can be the cause4occasional pain inside belly button? (esp when bending back)

Yes. A small umbilical hernia can be present and not felt or seen. But most surgeons can detect them by feeling. It's more difficult if people are very heavy.
Umbilical pain. Pain inside your umbilicus could be a symptom of a small hernia. There are some other possibilities. Okay to check in with your doc. An ultrasound of the abdominal wall can be helpful.
Strain. Yes it is possible but it could be abdominal strain. If you have a hernia see a surgeon and they will fix it.

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