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According to Hindu and Buddhist teachings, your body contains many thousands of chakras, or energy centres, but your seven main chakras are aligned from the base of your spine to the crown of your head. Each chakra corresponds to the health of a set of organs or glands. If your chakras are out of balance, it is said that this will affect your health, or vice versa.
There are a number of apps to help you tune your chakras, many free, but I chose Jonathan Goldman's Chakra Tuner. On his website, Goldman explains that he is author of Healing Sounds, creator of album Chakra Chants, president of music label Spirit Music and director of the Sound Healers Association, which suggests he knows what he is doing in this field.
If this is a new field to you, the app gives you a rundown on each chakra. Besides being associated with a set of organs, each chakra has its own colour, associated gemstone, related musical note and vowel sound. Om, the sound we most often associate with Eastern spirituality, is associated with your seventh chakra, the crown chakra. This, in turn, is said to be the foundation of your spiritual, or better, self. If you're feeling a bit egotistical, it is probable that your crown chakra is out of kilter.