Ah, Pain...It's the cause of so many frustrations and discomfort and can seem life ending in some situation... Even when being explained the source of your pain by a medical professional, you still can't always explain it. And many patients don't understand how the site of their injury still hurts even though the tissue has healed.
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Over the past 20 years, the medical community has made great progress in understanding the multi facets and layers of pain, and with the help from researchers in pain science, the now more accepted model of describing pain is the biopsychosocial model.  In short, pain is seen as an interaction among and within the biological, psychological and social factors, unique to each individual.

SCIATICA: The Other S Word Everybody Dread

If you have experienced sciatica, know someone who has experienced it first hand or heard that term before, you must know it is a very debilitating condition that can arise... generally suddenly, without warning signs.

Sciatica is not a diagnosis. It is a symptoms that can originate from various medical condition.
It refers to the pain one feels down their buttocks, thighs and/ or below their knee and possibly into foot and toes. It occurs with certain motions and originates in the lower back( your lumbar spine and tailbone/ the last 5 spinal vertebrae and sacrum) when your sciatic nerve ( the largest nerve in your body) or one of its nerve roots( the nerve origin coming out between each vertebrae of your spine) gets irritated by another structure.
This creates serious and acute pain down your lower back, buttocks, thighs and sometimes all the way down  to your toes. Sharp, searing, and shooting pain, "zingers", numbness, tingling, " cold water running down my leg" are common description of sciatica.