I am seeking some advice on what may be causing a sore throat, canker sores and chest discomfort. This happens when I'm not real consistent on B12 injections and folate. I still take the B12 several times a week but it feels like I needs injections nearly every day. Once I get the consistency back, it takes several days to weeks to subside and I'm not sure whether it is low folate or low b12 or both. It feels like it is low B12 that causes this but from reading Freddd's symptom list it sounds like low folate. What is most interesting is that these are not the symptoms I had when I found out I had methylation issues (low B12). I have been using Methyl b12 for 6 years and it has turned many things around. The sore throat, canker sores, and chest discomfort are new and repeatable. Any thoughts?