Are tissues in the body capable of sensing pain?

[volcob]

in that case, were goin back to the defenition

not quite... The body has a function so that potentially harmful stimuli are interpreted as pain -

"In physiology, a stimulus is a detectable change in the internal or external environment." -wikipedia

when your eyes arent used to the light then suddenly exposed to large amount of it, it illicits reflex such as covering it or turning away from it

"When a stimulus is applied to a sensory receptor, it elicits or influences a reflex via stimulus transduction. A stimulus is often the first component of a homeostatic control system. When a sensory nerve and a motor nerve communicate with each other, it is called a nerve stimulus. A stimulus can also be a reaction to a change in your environment. Any of your five senses will accommodate to a particular stimulus." -wikipedia

the very reason why we have this is that to maintain internal balance
or what else is the reason why its there?

. Also, when you touch a hot stove you don't burn your finger immediately, because the very high temperature alerts the body "Hey you idiot take your hand away from there, it's hot and will burn you

it sometimes(actually) does thats why I hate ironing when i was young

there is the reflex (its not even delayed) but due to the fact that the iron is very hot a split second of exposure can hurt
but the response of the body will prevent a further damage and that is exactly what you were saying