Answer

Yes, generally you may have chaas after completing Aatthai, but it should be taken carefully and in a proper way.

Explanation

After Aatthai, the digestive system is very weak because the body has been without regular food for many days. So even though chaas is light, it should not be taken suddenly in large quantity.

It is usually better to:

• First do parna properly as guided by your family/guru tradition.
• Take only a small amount of chaas.
• Make sure it is fresh, thin, and not too sour.
• Avoid adding strong spices, chili, or too much salt.
• Drink slowly, not in a hurry.

Spiritual Understanding

In Jain Dharma, tapasya is not only about fasting but also about ending the fast with awareness, humility, and control. Parna should be done with care so that the body remains stable and the spiritual benefit of tapasya is preserved.

Takeaway

You can have chaas after Aatthai, but take it in a small, simple, and gentle form. If your health is weak or you feel discomfort, follow guidance from an experienced elder, doctor, or your guru tradition.