Solar Plexus chakra is located at the spine, just above the naval and is associated with intellect and thinking process, our personal power, anger, strength and the ability to take action. It is the seat of your emotions. This is where your gut feelings come from. When your solar plexus is weak you may feel a mental slump, lethargy, feeling isolated and overcautious. An overactive one can cause nervousness, mental bullying or unrest, digestive problems, mental overload and a general feeling of disharmony.