There are a lot of misconceptions about the Kundalini flow in Eastern Philosophies. First of all it is seen as a spiralling energy that comes from the root chakra which it affects but is not its source.
When a soul comes into a life and they want to have tremendous spiritual growth, or the potential of ascension, they always plan to open the Kundalini energy flow, which is the first activation of the sacred sphere.
What the Kundalini does, is, it shifts the vibration of your DNA structure. There is a sphere around the mental body which is used in mastery that simply is inactive before the activation of the Kundalini.
On this earthly sphere there are 7 energy centers called the elemental chakras. One in each of the 4 directions, north is air, west is fire, south is earth, and east is water. Then there is a body elemental which sits below, a soul elemental that sits within between where the solar plexus and heart chakras are, which connects the soul to the sphere and a divine mind elemental that sits above.
The Kundalini flow is divine energy which enters the body elemental from the higher self and moves up into the root chakra where it activates the DNA creation centre that sits slightly higher and on the back side of the body from the root chakra. This centre enacts the shift in vibration programmed in by the higher self while the body was being created in the womb.
In men this is the only time the DNA creation centre becomes active, in women the centre activates at conception and stays open for about the first 4 weeks of pregnancy for the soul of the baby to attach its energies to the body being formed. Women plan to either have their children before any Kundalini activation, wait until it is complete, or choose to not have children.
The activation of the DNA creation centre and shift in vibration during pregnancy beyond the normal 4 weeks would cause loss of the pregnancy. From there the energy moves upward through all the chakras shifting the vibrational frequency of the DNA as it goes.
When it reaches the soul elemental more energy is added and it continues to move upward until it has moved through the head and leaves through the divine mind elemental chakra above and exits back to the higher self. This flow then continues forever. It is a spiral energy and entwines itself around the natural pre Kundalini flow (normal energy flow) that enters the crown chakra on top of the head and goes downward though the chakras exiting the root.
The whole process can take from 6 months to 10 years. It can begin as early as 6 to 12 months of age. Many of the very enlightened children that are coming to the planet now have opened their Kundalini fully by the age of 2 or 3.
It is always something we plan for our life and there are a few reasons why. First higher self must decide how big of a vibrational jump will be made with the Kundalini opening. The process can be very difficult if a jump that is too large is made.
Many people have died in the process of opening their Kundalini when the higher self either planned to large of a jump, or the person didn’t do the preparation before hand.
Basically speaking if a soul's plan was to start to explore spiritual teachings at the age of 25 and then have its Kundalini begin to open at the age of 35; If the soul never started to explore spirituality at 25 that’s 10 years worth of growth and raising its vibration which never occurred. So when the Kundalini begins to open at 35 the soul would be unprepared for the shift in vibration.
The Kundalini always begins at a prearranged time. This is one of the misconceptions in the Eastern Philosophy, the belief that you can do anything that will activate the Kundalini flow. It has been a major frustration of the Yoga community that some without any effort seem to open it while another can spend a whole life of practice and discipline to no avail.
A large vibrational jump can cause intense stress on the body. Many people recognise the "symptoms" when it is talked about, and realize that their Kundalini has opened, or know exactly where it is in the process. As they have some of the symptoms at each stage, which disappear as mysteriously as they began when the Kundalini moves up to the next stage.
Stages of the Kundalini and typical issues that may arise:
Root chakra: colon problems, urinary tract infections, constipation, bad cases can result in colon or prostate cancer.
Navel chakra: Conception problems in woman ovarian cancer, irregular menstrual bleeding, uterine cysts, candida albicans over growth in the intestines, appendicitis, kidney problems, intense discomfort in the minor chakras of the spiritual body that are just below the hip bone in the front on each side.
Solar Plexus chakra: gall stones, pancreatic problems, shortness of breath, stomach issues heartburn, ulcers
Heart chakra: palpitations, heart attack; tightness in chest is common. A feeling of intense pressure on the chest, lung congestion, during both the heart and the throat time period. A discomfort in the upper minor spiritual chakras that are on the upper chest (slightly up and 1 to 2 inches from the armpit) the discomfort may be felt on the front or in back behind the shoulder blade
Throat chakra: Sore throat, difficulty expressing thoughts, a singer may experience a shift in their voice or an inability to sing for a period. Thyroid problems, an intense tightness up the spine at the back of the neck, high blood pressure often accompanies this period through the end and may start at the period of the heart chakra.
Mind chakra (third eye): headaches, vision distortion, a need for glasses, trouble concentrating, pressure in the head the feeling of a band around the forehead, extreme cases aneurysm or stoke
Crown chakra: this is the breakthrough point sometimes people think they are going crazy. There are often rushes of energy, dizziness, people become ungrounded for a time have trouble staying in their body.