1 Pain that does not diminish with rest, and pain that may be worse at night than during the day. 2  Back pain along with constitutional symptoms, such as loss of appetite, unplanned weight loss, nausea, vomiting, or fever, chills or shakes.
Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.
Health Benefits of Onions. The health benefits of onions are often overlooked because of their pungent smell and sharp taste and many people prefer to give them a miss. What a shame if that's the case for you! If you want to know what you're missing read on and you might change your mind.