This is one of the most common things I hear day to day working in Massage. Muscular aches and pains are something every person from desk workers to warehouse labourers just cannot escape.
So what makes muscles "tight"? Since tightness, pain and aching are all subjective sensations, there isn't one correct answer. Anatomically, a tight muscle could come from a muscular spasm, causing a shortening of the contractile muscular tissue, or the increase of fascial adhesions. Fascia is normally occurring connective tissue that covers every muscle, organ, blood vessel and nerve in the body. Adhesions can build up in the tissue by repetitive stress, injury, trauma, increased activity or being inactive for long periods of time. Physically feeling those sensations does not necessarily mean you have an anatomical shortening of the muscle, but it could be caused by any of the following factors: