Stress.

Tang Chunlan sneezed lightly when she stepped into her father's office.

Am I being cursed by that old hag?

"Do you have a cold?" Her father frowned.

"No, Father. I am alright."

She sat down.

He brought out a bunch of documents and put it on the table, looking at her with slight hesitation.

"You have not yet recovered. Are you sure you want to work now?"

"Yes, Dad. Give me the account books please."

She asked patiently.

He sighed and gave her the books. "Don't overwork yourself. If you feel tired just go home. No need to wait for me.

"Okay, Dad."

"I have to go. I have another board meeting."

She nodded, too engrossed in reading already. Hearing the door shut quietly, she furrowed her eyebrows in distress.

The account books were a little bit dusty but were kept and written in an orderly fashion. As she turned the pages, she felt her head ache from all the numbers she saw.

I hate numbers, signs, anything related to Mathematics!