Roles of the Chakras & Symptoms of Imbalance in their Functioning

Chakras can be unbalanced for many reasons. The following is only a set of commun Chakra Imbalances but it's not an exhaustive list.

7th Chakra - Crown chakra: Accessing the Source of Power and Energy, Divine Connection, Knowing yourself as the creator of your reality.

Under-activity: Helplessness, Abandoning all attempts to take the power in your own life (especially if the chakra is really damaged), Reactivity, Not being in control of your experience in life, Being a victim of life situations or others.

Hyperactivity: Being full of yourself, Seeking to take over control, Wanting to control everything, Abusing your authority.

6th Chakra - 3rd Eye: Intuition, Focused Intention, Mental acuity, Connection to the Higher Identity.

Under-activity: Disconnection from your Higher Identity or being totally unconscious of this part of you, Inability to access your intuitive capacities, Not considering the spirituel plan of your life as a source of guidance and insight. Difficulty concentrating and using intention, Not grasping the power of intention.
This can manifest physically by migraines, headaches or focusing problems.

Hyperactivity: Being totally and exclusively focused on the spirituel plane, Not paying attention or not considering the linear mind, Not being grounded and balanced (Having wings but not roots).

5th chakra - Throat Chakra: Communication, Ability to say and to hear the Truth, Authentic Expression of the Self.

Under-activity: Difficulty expressing yourself and being confident. Feeling under pressure when not communicating your true feelings. Can also manifest itself by an inability to listen to others, Not hearing what other are saying, Talking too much.

Hyperactivity: Being jugdemental, Critisizing yourself and others, Being too persistent and stubborn.
This imbalance can also be present in people who do a lot of teaching and "Channeling".

4th Chakra - Heart Chakra: Ability to receive and to give love to others as well as to yourself, Being connected to the frequency of love, Emotional Center, Bridge between higher and lower chakras.

Under-activity: Tendancy to judge severely, Critizising yourself, Being emotionally closed and hard on yourself, Not loving and accepting yourself, Difficulty receiving love from others, Having blocks to divine love.
This can also manifest itself as heart problems or disorders affecting the immune system or even a lack of compassion.

Hyperactivity: Giving too much (of your time and/or energy) to others and being physically and emotionally drained and empty, Always putting yourself last, Always wanting to help and assist everybody, Physical and emotional fatigue.
In some rare cases, this imbalance can also show up as a narcissistic attitude.

3rd Chakra - Solar Plexus Chakra: Individuality and will power, Self-Esteem, Ability to set goals and to achieve them, Personal accomplishments, Physical identity, The representation of personal success and power.

Under-activity: Being energetically blocked, Difficulty following your goals or even defining new ones, Being confused about your life and your identity, Not knowing your next step, Feeling like a victim.

Hyperactivity: Working hard and constantly without ever accomplishing something tangible. Being focused on productivity and keeping busy all the time but despite the effort, most of the times the work lacks focus.
This block can also cause anger and frustation (because of the stagnation).

2nd Chakra - Sacral Chakra: Sexuality, Creation and creativity, Ability to physically manifest your dreams and wishes, Abondance.

Under-activity: Being unable to manifest and develop your projects in the physical. You can be mentally or emotionally active but never create or produce something tangible. Having many ideas but never being able to earn a living and create abondance from them. Difficulty creating and receiving physical abondance (money, wealth).
This can also manifest as sexual disorders or difficulty conceiving because the 2nd Chakra deals with creation energy.

Hyperactivity: Sexual disorders, Obsession to accumulate possessions and material wealth, can also manifest as an inability to ever let go and give, Hoarding, Tendency to clutter up.

1st Chakra - Root Chakra: Being grounded in the physical world, Connection to the Earth/Family/Tribe, Feeling physcially safe and secure.

Under-activity: Being uprooted/disconnected, Feeling physically insecure, Being a victim of violence.
The imbalance can also manifest in subtle bodies (emotional, mental or spiritual). Under-activity in the spiritual body can cause a feeling of not being at home and welcome, here on Earth.
It can also affect those actively working on their spiritual growth who lose any interest in physical life or neglect their physical needs.

Hyperactivity: Being really blocked for moving on spiritually, Being obsessed with security (fear of being physically in danger), Being dependent of others especially your family, Tending to spend time with your immediate family and prefering to always have familiar faces around you, Being afraid of the unknown.
This imbalance can also show up as a rejection to move on - even on a physical level such as staying always at home and being too grounded.