Are you suffering from back pains? And you really want to know, as quickly as possible, what it may be that is causing this? Let's first list them - and, then, go into what they are; more spefically.
If you are paralysed, if your sensation-sense is lacking, if your reflexes are worse than usual, if you feel a lack in control over your movement, if you have a problem breathing, if you cannot control your bowels, if bladder-control is worsened, if your body is painful, if you are oversensitive to stimulation, if a muscle is spasming, if you are sexually less functional. All those things are signs that you COULD be suffering from this.
Before we do anything else, let's define it. This comes from either a direct-hit to the actual spinal-cord, or because things in the surroundings, like a bone or some soft tissue, comes to be damaged.

Let us go into an explanation of the mentioned spinal injury symptoms to clear out what they are. Being paralyzed simply means you cannot move your body - either parts of it, or it all. When your sensation-sense is weakened, you cannot feel things, with your fingers for example, as much as you could before. When your reflexes are not as functional, you are slower to react to things - which could become dangerous in traffic-situations (to name a few).

Lacking bladder-control simply means you have a hard time dictating whether you are going to pee or not - rendering probable that you will pee in public, without wanting to, and not pee when by a toilet, at a time when you would like to. If lacking bowel-control, you cannot dictate your body when it comes to shitting - meaning you might need diapers. Muscle-spasms simply is when your muscles are twitching -- your muscle-controls are not as good as they usually are. When overreactive to stimulation, any sound, or movement - or anything that will stimulate your mind, is going to feel much more powerful; sometimes to the point where you become very scared because of it.

So, those were some of the spinal injury symptoms existing and more information about which each one is, and also a definition of the actual injury.