Can lower tooth infection cause pain in upper teeth?

Yes: We call this referred pain. When you see your dentist tell them where the pain started, because the area of pain you have now might have a cause elsewhere.

Yes: It is possible to have referred pain to the upper teeth.

Yes and ear pain : Sometimes because of the distribution of nerve and blood vessel to the upper and lower jaw from the main branch.

Yes, but: Yes, but then when the lower tooth infection is treated, the upper tooth pain should vanish.