The heart meridian is considered to be the seat of spirituality as well as the ruler of wisdom and good judgement. The heart moreover also rules clarity of speech; that is why words can touch our heart so deeply in a positive way or hurt so deeply.
Symptoms indicating an imbalance or blockage:
• Sadness and sorrow
"Where there is love, there is no fear. Where there is fear, there is no love." (Yogi Bhajan)
What best to eat?
• All red foods: red peppers, watermelon, cherries, red grapes, strawberries, grapefruit, red cabbage, etc.
What to reduce or avoid?
• Be aware: too much bitter foods is not good
General tips to help this meridian:
• Wear red clothes or carry red stones (red coral, garnet, rose quartz) over the heart or on the little finger.
Yoga for the heart meridian:
• Cow Mudra: Grab your hands behind your back. One arm goes over the shoulder, with the other under and behind the back. Do breath of fire for 3 minutes, then reverse the arms and repeat. If your hands don't touch, you can hold on to the ends of a small towel or cloth.
There are dozens of Kundalini Yoga kriyas for the Heart Chakra. I even run 3-day retreats and 10-session private class series on this topic. Here are a few nice ones to practice: