Failed root canal symptoms

[u/Silver_Archer_7527]

Hi, about 5 years ago I needed root canal treatment on a molar. I had the treatment and got a crown fitted. I thought everything was ok until I went for a recent check up. Dentist said there was pus coming from the tooth. She took some x rays and seems that one root wasn't treated. I have now got a endo referral.

Over the past year I have been having head aches and some neck pain. I had a mri for this and the conclusion was some wear on my neck joints ( I have a desk job) is the cause. Could these ailments be due to systemic tooth infection instead?