Passing stool is one of the greatest sources of detoxification of bad things. If bowl movement deteriorates then no one can control for upcoming diseases.  This is the reason we called it “constipation is a mother of all diseases”. This is a chief cause of many diseases, like piles, appendicitis, arthritis, high blood pressure, heart burning, memory loss, common headache, varicose veins etc.
Symptoms; the most common symptom of constipation are, difficulty in passing stool, ulcer in the mouth, bloatedness, varicose veins, pain in lumber and abdominal region.
Causes; I have studied in my case study, the two most important cause of chronic constipation, mental and physical.
Faulty life style and wrong diet is a main cause of mental fluctuation, like stress, anger and anxiety etc.    
Yogic treatment; it is a treatment of increasing self effort. As I experienced in my yogic life, if it is treated properly, the whole problem of acute constipation can be solved. I only want to mention asana or poses and pranayam here as for general. General people can get benefit. But I would like to mention in specific reason, if anybody have other serious problems, they must be consulted to experienced guru before practicing these asana and pranayam.
Normally guru insist to do poses which is based on stomach, but I prefer back strengthening exercises more because small and colon is govern from lower back or swadhisthan and Manipur chakra.
SHALABH ASANA
Lie down on your stomach; rest your chin on your down turned hands. Your spine should be straight. Forehead should be relaxed. In this position now take a deep breath and inhaling raise your right leg straight as easily as you can .Hold it in this position holding the breath .Now bring the leg down, slowly exhaling at the same speed.
Repeat the same with the left leg. And after that do this with both legs. Repeat 10 times with each leg and 5 times with both legs.
Benefit-
Generally constipated people have disturbed navel. This exercise is excellent for navel alignment and lumber strengthening
 
Dhanur Asana (Bow Pose)
Dhanur asana is derived from the word dhanu, which basically means Bow. In this asana, we have to stretch our body in the form of bow and arrow. It helps in strengthening our abdominal and lumbar parts.
TECHNIQUE:
Lie down on your stomach on the flat floor. Let your body relax and take 2 or 3 deep breaths. Now fold both legs at the knee and taking both hands to the back of leg, clutch your ankle joints; now raise upper and lower part of the body while exhaling. Hold this position for 5 seconds. Now with inhaling come back to the normal position.
TARGET POINT: The whole strain should be felt on the middle stomach and lower back region.
Benefit:  It helps in strengthening the middle part of stomach or navel, large and small intestine, pancreas and the whole spine. It also increases sexual ability.
Times: Repeat 3 to 4 times, after some time you can increase this with the help of an expert guru
Checkpoint
While lifting the leg there should be a strain in the navel region .At this point keep inhaling slowly in tandem with the speed of the leg that is being lifted.
At that moment breath should feel normal .If you have an acute back problem then don’t do this exercise with both legs for some time.  Do not turn your neck sideways during exercise.
Those are suffering from peptic ulcer and intestinal problems should not do this exercise.

Repetition: repeat 10 times.
PAVAN MUKT ASANA –
Lie on your back.  Take 5 to 10 deep breaths and relax .After that bend the right leg and lock your hands around it just below the knee .Take a deep breath, while exhaling, pull your knee towards your chest. Feel the buttocks and lower spine stretch. The thigh should touch the stomach .Hold this position for 5 seconds but do not hold the breath. Now straighten the leg inhaling at the same time and relax. Repeat it for the other leg. Do each leg ten times and do both legs together five times.
Target point- Lower back & abdomen become strong, digestive power is enhanced and gastric troubles are relieved.
Important point - Sometimes gastric troubles and intestinal disorders   are the cause of backache.
PRANAYAM;
There are lots of pranayam but especially for acute constipation, this sequence of pranayam is very effective for sufferer. Let start with Moolbandh, uddiyan bandh kapalbhanti, agnisar kriya and at the last do anulom-vilom pranayam.  If you don’t have time for physical exercises then you can to do these pranayam only, will get full benefit.