answer:It could be. Only one way to know for sure and that is a visit to the doctors. Tonsillitis can be nasty and leave you feeling quite awful, so I hope it is just a sore throat. When I had tonsillitis years ago, I had white blisters (for want of a better description) all down my throat and on my tonsils. It was excruciating to swallow and I felt very ill. I just did a very quick search for symptoms and those ulcers/blisters are a symptom of tonsillitis (and can also suggest glandular fever), along with swollen glands and fever. I stand by my opening comment…off to the doctor.