The pendulum reads energy patterns and has been used for many years as the ancient art of divination or dowsing.  The pendulum is a tool for communicating with the deeper, more hidden levels of our being.  It gives us access to the extraordinary powers of perception of our deeper selves.  The pendulum is simply an object suspended from a fixed point so it can swing freely (for example, a crystal, a ring, or a button could be used as a pendulum when tied to a string and suspended so that the object is able to move freely.)   Here is a way to find a block in the flow of energy in our body.  Take a piece of paper and write the person's name (could be your name) on top.  Under the name write the following: 
Physical Body
Etheric Body
Astral Body    
Mental Body
Settle yourself emotionally and ask the pendulum to show you "yes" and to show you "no."  After you have a clear indication of yes and no, hold the pendulum over the words Physical Body and ask "Is (name) physical body healthy?"  Record your response and any additional feelings or thoughts that develop.  Then move the pendulum over the words etheric body and ask "Is (name) etheric body healthy?"  and record your responses.  Do the same for the astral and mental bodies.  If you find one of the body dimensions has a negative response, you can try some of the following activities:  For the physical body, rest, diet, exercise, massage and medicine may be required.  if there is actual structural damage, surgery may be necessary.  For the etheric body, rest,  rhythmic breathing and rhythmic motions, fresh air, sunshine and baths may be helpful.  For the emotional body, the arts, creative activity, warm social relationships with harmonious people, color therapy and good music may be helpful.  For the mental body, meditation and concentration exercises might be helpful.  Source: Pendulum Power by Greg Nielsen & Joseph Polansky.