T cells, which are one type of white blood cell in the immune system, somehow become sensitized to proteins in the CNS. When T cells become activated, they enter the CNS through blood vessels and produce damaging inflammation.
1 Fatigue or Tiredness: Feeling fatigued or more tired than usual, is a pregnancy symptom which can also start as early as the first week after conception.  Morning Sickness or Nausea: This well-known pregnancy symptom will oftentimes show up between 2-8 weeks after conception.
Pregnancy. Pregnancy is associated with nausea after eating coupled with an increased appetite. In the first trimester of pregnancy, sick feelings, vomiting or nausea are common. The extent of nausea and vomiting differ from a woman to woman.ell, there are a large number of causes linked with nausea after eating. The most common include: 1  Food poisoning. 2  Peptic ulcer. 3  Dyspepsia. 4  Celiac disease. 5  Anxiety.