At different times in the past year or so, I have experienced worsened short-
term memory, inability to focus well, easy fatigue, arm numbness, finger numbness, as well as more frequent headaches in the past year or so (the MTA having been put 2 years ago). All of these appear to coincide with the neurological symptoms of chronic arsenic poisoning (check article: A REVIEW OF ARSENIC POISONING AND ITS EFFECTS ON HUMAN HEALTH).