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People with achalasia will often have trouble swallowing or feel like food is stuck in their oesophagus. This is also known as dysphagia. This symptom can cause coughing and raise the risk of aspiration, or inhaling or choking on food.
Other symptoms may include:
•pain or discomfort in your chest
•extreme and very quick weight loss (I lost 12kgs in 6weeks when undiagnosed)
•heartburn
•intense pain or discomfort after eating - almost like a side stitch, usually I get this under my rib cage
You may also have regurgitation or backflow - I usually suffer with this after eating past 7pm and/or trying to sleep after eating something heavy and it's not had the chance to push through to my stomach. However, these can be symptoms of other gastrointestinal conditions such as acid reflux.
Source: http://www.healthline.com/health/achalasia#overview1